diff --git a/docs/api.md b/docs/api.md
index c652f4f7f..f0e44d769 100644
--- a/docs/api.md
+++ b/docs/api.md
@@ -3,8 +3,8 @@
 ## Table of contents
 
 - [Pool](#pool)
-  - [`pool = new FixedThreadPool(numberOfThreads, fileURL, opts)`](#pool--new-fixedthreadpoolnumberofthreads-fileurl-opts)
-  - [`pool = new DynamicThreadPool(min, max, fileURL, opts)`](#pool--new-dynamicthreadpoolmin-max-fileurl-opts)
+  - [`pool = new FixedThreadPool(numberOfThreads, specifier, opts)`](#pool--new-fixedthreadpoolnumberofthreads-specifier-opts)
+  - [`pool = new DynamicThreadPool(min, max, specifier, opts)`](#pool--new-dynamicthreadpoolmin-max-specifier-opts)
   - [`pool.execute(data, name, abortSignal, transferList)`](#poolexecutedata-name-abortsignal-transferlist)
   - [`pool.mapExecute(data, name, abortSignals, transferList)`](#poolmapexecutedata-name-abortsignals-transferlist)
   - [`pool.start()`](#poolstart)
@@ -25,20 +25,20 @@
 
 ## Pool
 
-### `pool = new FixedThreadPool(numberOfThreads, fileURL, opts)`
+### `pool = new FixedThreadPool(numberOfThreads, specifier, opts)`
 
 `numberOfThreads` (mandatory) Number of workers for this pool.\
-`fileURL` (mandatory) URL to a file with a worker implementation.\
+`specifier` (mandatory) Specifier to a file with a worker implementation.\
 `opts` (optional) An object with the pool options properties described below.
 
-### `pool = new DynamicThreadPool(min, max, fileURL, opts)`
+### `pool = new DynamicThreadPool(min, max, specifier, opts)`
 
 `min` (mandatory) Same as _FixedThreadPool_ numberOfThreads, this number of
 workers will be always active.\
 `max` (mandatory) Max number of workers that this pool can contain, the newly
 created workers will die after a threshold (default is 1 minute, you can
 override it in your worker implementation).\
-`fileURL` (mandatory) URL to a file with a worker implementation.\
+`specifier` (mandatory) Specifier to a file with a worker implementation.\
 `opts` (optional) An object with the pool options properties described below.
 
 ### `pool.execute(data, name, abortSignal, transferList)`
diff --git a/src/pools/abstract-pool.ts b/src/pools/abstract-pool.ts
index 4fa4c4fd0..4eee582ea 100644
--- a/src/pools/abstract-pool.ts
+++ b/src/pools/abstract-pool.ts
@@ -41,7 +41,7 @@ import {
 } from './selection-strategies/selection-strategies-types.ts'
 import { WorkerChoiceStrategiesContext } from './selection-strategies/worker-choice-strategies-context.ts'
 import {
-  checkFileURL,
+  checkSpecifier,
   checkValidPriority,
   checkValidTasksQueueOptions,
   checkValidWorkerChoiceStrategy,
@@ -152,13 +152,13 @@ export abstract class AbstractPool<
    * Constructs a new poolifier pool.
    *
    * @param minimumNumberOfWorkers - Minimum number of workers that this pool manages.
-   * @param fileURL - URL to the worker file.
+   * @param specifier - Specifier to the worker file.
    * @param opts - Options for the pool.
    * @param maximumNumberOfWorkers - Maximum number of workers that this pool manages.
    */
   public constructor(
     protected readonly minimumNumberOfWorkers: number,
-    protected readonly fileURL: URL,
+    protected readonly specifier: URL | string,
     protected readonly opts: PoolOptions,
     protected readonly maximumNumberOfWorkers?: number,
   ) {
@@ -168,7 +168,7 @@ export abstract class AbstractPool<
       )
     }
     this.checkPoolType()
-    checkFileURL(this.fileURL)
+    checkSpecifier(this.specifier)
     this.checkMinimumNumberOfWorkers(this.minimumNumberOfWorkers)
     this.checkPoolOptions(this.opts)
 
@@ -208,7 +208,7 @@ export abstract class AbstractPool<
   private checkPoolType(): void {
     if (this.type === PoolTypes.fixed && this.maximumNumberOfWorkers != null) {
       throw new Error(
-        'Cannot instantiate a fixed pool with a maximum number of workers specified at initialization',
+        'Cannot instantiate a fixed pool with a maximum number of workers defined at initialization',
       )
     }
   }
@@ -2292,15 +2292,19 @@ export abstract class AbstractPool<
    * @returns The created worker node.
    */
   private createWorkerNode(): IWorkerNode<Worker, Data> {
-    const workerNode = new WorkerNode<Worker, Data>(this.worker, this.fileURL, {
-      workerOptions: this.opts.workerOptions,
-      tasksQueueBackPressureSize: this.opts.tasksQueueOptions?.size ??
-        getDefaultTasksQueueOptions(
-          this.maximumNumberOfWorkers ?? this.minimumNumberOfWorkers,
-        ).size,
-      tasksQueueBucketSize: defaultBucketSize,
-      tasksQueuePriority: this.getTasksQueuePriority(),
-    })
+    const workerNode = new WorkerNode<Worker, Data>(
+      this.worker,
+      this.specifier,
+      {
+        workerOptions: this.opts.workerOptions,
+        tasksQueueBackPressureSize: this.opts.tasksQueueOptions?.size ??
+          getDefaultTasksQueueOptions(
+            this.maximumNumberOfWorkers ?? this.minimumNumberOfWorkers,
+          ).size,
+        tasksQueueBucketSize: defaultBucketSize,
+        tasksQueuePriority: this.getTasksQueuePriority(),
+      },
+    )
     // Flag the worker node as ready at pool startup.
     if (this.starting) {
       workerNode.info.ready = true
diff --git a/src/pools/thread/dynamic.ts b/src/pools/thread/dynamic.ts
index 5fe5de959..c460a03cc 100644
--- a/src/pools/thread/dynamic.ts
+++ b/src/pools/thread/dynamic.ts
@@ -32,16 +32,16 @@ export class DynamicThreadPool<
    *
    * @param min - Minimum number of threads which are always active.
    * @param max - Maximum number of threads that can be created by this pool.
-   * @param fileURL - URL to an implementation of a `ThreadWorker` file.
+   * @param specifier - Specifier to an implementation of a `ThreadWorker` file.
    * @param opts - Options for this dynamic thread pool.
    */
   public constructor(
     min: number,
     max: number,
-    fileURL: URL,
+    specifier: URL | string,
     opts: ThreadPoolOptions = {},
   ) {
-    super(min, fileURL, opts, max)
+    super(min, specifier, opts, max)
     checkDynamicPoolSize(
       this.minimumNumberOfWorkers,
       this.maximumNumberOfWorkers!,
diff --git a/src/pools/thread/fixed.ts b/src/pools/thread/fixed.ts
index beed94db9..321643e70 100644
--- a/src/pools/thread/fixed.ts
+++ b/src/pools/thread/fixed.ts
@@ -26,16 +26,16 @@ export class FixedThreadPool<
    * Constructs a new poolifier fixed thread pool.
    *
    * @param numberOfThreads - Number of threads for this pool.
-   * @param fileURL - URL to an implementation of a `ThreadWorker` file.
+   * @param specifier - Specifier to an implementation of a `ThreadWorker` file.
    * @param opts - Options for this fixed thread pool.
    */
   public constructor(
     numberOfThreads: number,
-    fileURL: URL,
+    specifier: URL | string,
     opts: ThreadPoolOptions = {},
     maximumNumberOfThreads?: number,
   ) {
-    super(numberOfThreads, fileURL, opts, maximumNumberOfThreads)
+    super(numberOfThreads, specifier, opts, maximumNumberOfThreads)
   }
   /** @inheritDoc */
   protected isMain(): boolean {
diff --git a/src/pools/utils.ts b/src/pools/utils.ts
index f1a68fb03..2ad453c98 100644
--- a/src/pools/utils.ts
+++ b/src/pools/utils.ts
@@ -58,12 +58,14 @@ export const getDefaultTasksQueueOptions = (
   })
 }
 
-export const checkFileURL = (fileURL: URL | undefined): void => {
-  if (fileURL == null) {
-    throw new TypeError('The worker URL must be specified')
+export const checkSpecifier = (specifier: URL | string | undefined): void => {
+  if (specifier == null) {
+    throw new TypeError('The worker specifier must be defined')
   }
-  if (fileURL instanceof URL === false) {
-    throw new TypeError('The worker URL must be an instance of URL')
+  if (typeof specifier !== 'string' && !(specifier instanceof URL)) {
+    throw new TypeError(
+      'The worker specifier must be a string or an instance of URL',
+    )
   }
 }
 
@@ -178,7 +180,7 @@ export const checkValidTasksQueueOptions = (
 
 export const checkWorkerNodeArguments = (
   type: WorkerType | undefined,
-  fileURL: URL | undefined,
+  specifier: URL | string | undefined,
   opts: WorkerNodeOptions | undefined,
 ): void => {
   if (type == null) {
@@ -189,7 +191,7 @@ export const checkWorkerNodeArguments = (
       `Cannot construct a worker node with an invalid worker type '${type}'`,
     )
   }
-  checkFileURL(fileURL)
+  checkSpecifier(specifier)
   if (opts == null) {
     throw new TypeError(
       'Cannot construct a worker node without worker node options',
@@ -396,12 +398,12 @@ export const messageListenerToEventListener = <Message = unknown>(
 
 export const createWorker = <Worker extends IWorker>(
   type: WorkerType,
-  fileURL: URL,
+  specifier: URL | string,
   opts: { workerOptions?: WorkerOptions },
 ): Worker => {
   switch (type) {
     case WorkerTypes.web:
-      return new Worker(fileURL, {
+      return new Worker(specifier, {
         ...(runtime === JSRuntime.bun && { smol: true }),
         ...opts.workerOptions,
         type: 'module',
diff --git a/src/pools/worker-node.ts b/src/pools/worker-node.ts
index 19f77e2c6..ca650b692 100644
--- a/src/pools/worker-node.ts
+++ b/src/pools/worker-node.ts
@@ -48,13 +48,17 @@ export class WorkerNode<Worker extends IWorker, Data = unknown>
    * Constructs a new worker node.
    *
    * @param type - The worker type.
-   * @param fileURL - URL to the worker file.
+   * @param specifier - Specifier to the worker file.
    * @param opts - The worker node options.
    */
-  constructor(type: WorkerType, fileURL: URL, opts: WorkerNodeOptions) {
+  constructor(
+    type: WorkerType,
+    specifier: URL | string,
+    opts: WorkerNodeOptions,
+  ) {
     super()
-    checkWorkerNodeArguments(type, fileURL, opts)
-    this.worker = createWorker<Worker>(type, fileURL, {
+    checkWorkerNodeArguments(type, specifier, opts)
+    this.worker = createWorker<Worker>(type, specifier, {
       workerOptions: opts.workerOptions,
     })
     this.info = initWorkerInfo(this.worker)
diff --git a/tests/pools/abstract-pool.test.mjs b/tests/pools/abstract-pool.test.mjs
index cdffcba7a..5c17bfe09 100644
--- a/tests/pools/abstract-pool.test.mjs
+++ b/tests/pools/abstract-pool.test.mjs
@@ -65,12 +65,14 @@ describe({
       expect(pool.destroying).toBe(false)
     })
 
-    it('Verify that fileURL is checked', () => {
+    it('Verify that specifier is checked', () => {
       expect(() => new FixedThreadPool(numberOfWorkers)).toThrow(
-        new TypeError('The worker URL must be specified'),
+        new TypeError('The worker specifier must be defined'),
       )
       expect(() => new FixedThreadPool(numberOfWorkers, 0)).toThrow(
-        new TypeError('The worker URL must be an instance of URL'),
+        new TypeError(
+          'The worker specifier must be a string or an instance of URL',
+        ),
       )
     })
 
@@ -127,7 +129,7 @@ describe({
           ),
       ).toThrow(
         new Error(
-          'Cannot instantiate a fixed pool with a maximum number of workers specified at initialization',
+          'Cannot instantiate a fixed pool with a maximum number of workers defined at initialization',
         ),
       )
     })
diff --git a/tests/pools/thread/dynamic.test.mjs b/tests/pools/thread/dynamic.test.mjs
index b86629b3e..d66bdc11d 100644
--- a/tests/pools/thread/dynamic.test.mjs
+++ b/tests/pools/thread/dynamic.test.mjs
@@ -104,7 +104,7 @@ describe({
 
     it('Validation of inputs test', () => {
       expect(() => new DynamicThreadPool(min)).toThrow(
-        'The worker URL must be specified',
+        'The worker specifier must be defined',
       )
     })