Related Words API

Related Words API

Related Words API retrieves related words and their associations, including synonyms, antonyms, and other relationships, along with part of speech and cosine similarity."

API description

About the API:


Our Related Words API is a powerful tool for retrieving related and associated words. The API is able to retrieve synonyms, antonyms, hypernyms, hyponyms, and holonyms, along with the relationships between them. The API also returns part of speech and cosine similarity of the word which is a measure of similarity between two non-zero vectors of an inner product space.

The API is designed to be easy to use, you simply input a word and the API will return a list of related words along with their relationships, parts of speech, and cosine similarity. You can also customize the response by specifying the type of relationship you are interested in, such as synonyms, antonyms, or hyponyms.

The API can be used in many applications such as natural language processing, text analysis, and information retrieval. It can also be useful in writing, language education, and as a tool for improving vocabulary.

The API returns the data in JSON format, making it easy to integrate with other applications. It also supports multiple languages, so you can easily retrieve related words in different languages.

In summary, our Related Words API is a versatile and powerful tool that can help you to understand the relationships between words, and improve your writing, language skills, or text analysis.



What this API receives and what your API provides (input/output)?

Pass a word and receive a list of all related words and possible associations. 


What are the most common uses cases of this API?

  1. Improving writing: By using the API to find related words and synonyms, you can improve the vocabulary and style of your writing.

  2. Language education: Teachers can use the API to help students learn new words and their relationships in a target language.

  3. Text analysis: Researchers can use the API to analyze the relationships between words in a body of text, such as in sentiment analysis or topic modeling.

  4. Information retrieval: Use the API to find related words that can be used as search queries, to improve the precision and recall of search engines.

  5. Natural Language Processing: Use the API to find related words to improve machine learning models for natural language tasks such as question answering, sentiment analysis or text classification.

  6. Content generation: Use the API to find related words to generate new content, such as titles, headlines, or summaries.


Are there any limitations to your plans?

Besides API call limitations per month, there is no other limitation. 

API Documentation


Retrieve related and associated words (including synonyms, antonyms, hypernyms, hyponyms, and holonyms). Relationships, parts of speech, and cosine similarity are also returned.

Use the "Related Words and Associations" API to retrieve a word's:

  • Synonyms
  • Antonyms
  • Hypernyms (words with broader meanings)
  • Hyponyms (words with more specific meanings)
  • Holonyms
  • Meronyms
  • Contextually related words

For each returned word, you'll receive:

  • Cosine similarity (a measurement of the relative similarity between the associated word and the search word)
  • The parts of speech (e.g. noun, verb, adjective, adverb, etc.)
  • The relationships (e.g. synonym, antonym, hypernym, hyponym, etc.)

Use this API for writing apps, machine learning datasets, or anywhere you'll need to find or use related concepts.


Associated - Endpoint Features
Object Description
text [Required] The search word for which the endpoint will return related and associated words.
Test Endpoint


                                                                                                                                                                                                                            {"Example Response":"No response example available for now."}

Associated - CODE SNIPPETS

curl --location --request GET '' --header 'Authorization: Bearer YOUR_API_KEY' 


API Access Key & Authentication

After signing up, every developer is assigned a personal API access key, a unique combination of letters and digits provided to access to our API endpoint. To authenticate with the Related Words API REST API, simply include your bearer token in the Authorization header.


Header Description
Authorization [Required] Should be Bearer access_key. See "Your API Access Key" above when you are subscribed.

Simple Transparent Pricing

No long term commitments. One click upgrade/downgrade or cancellation. No questions asked.

🚀 Enterprise
Starts at $10,000/Year

  • Custom Volume
  • Dedicated account manager
  • Service-level agreement (SLA)

Customer favorite features

  • ✔︎ Only Pay for Successful Requests
  • ✔︎ Free 7-Day Trial
  • ✔︎ Multi-Language Support
  • ✔︎ One API Key, All APIs.
  • ✔︎ Intuitive Dashboard
  • ✔︎ Comprehensive Error Handling
  • ✔︎ Developer-Friendly Docs
  • ✔︎ Postman Integration
  • ✔︎ Secure HTTPS Connections
  • ✔︎ Reliable Uptime

Zyla API Hub is, in other words, an API MarketPlace. An all-in-one solution for your developing needs. You will be accessing our extended list of APIs with only your user. Also, you won't need to worry about storing API keys, only one API key for all our products is needed.

Prices are listed in USD. We accept all major debit and credit cards. Our payment system uses the latest security technology and is powered by Stripe, one of the world’s most reliable payment companies. If you have any trouble with paying by card, just contact us at [email protected]

Sometimes depending on the bank's fraud protection settings, a bank will decline the validation charge we make when we attempt to be sure a card is valid. We recommend first contacting your bank to see if they are blocking our charges. If more help is needed, please contact [email protected] and our team will investigate further

Prices are based on a recurring monthly subscription depending on the plan selected — plus overage fees applied when a developer exceeds a plan’s quota limits. In this example, you'll see the base plan amount as well as a quota limit of API requests. Be sure to notice the overage fee because you will be charged for each additional request.

Zyla API Hub works on a recurring monthly subscription system. Your billing cycle will start the day you purchase one of the paid plans, and it will renew the same day of the next month. So be aware to cancel your subscription beforehand if you want to avoid future charges.

Just go to the pricing page of that API and select the plan that you want to upgrade to. You will only be charged the full amount of that plan, but you will be enjoying the features that the plan offers right away.

Yes, absolutely. If you want to cancel your plan, simply go to your account and cancel on the Billing page. Upgrades, downgrades, and cancellations are immediate.

You can contact us through our chat channel to receive immediate assistance. We are always online from 9 am to 6 pm (GMT+1). If you reach us after that time, we will be in contact when we are back. Also you can contact us via email to [email protected]

 Service Level
 Response Time




Related APIs