Find the Perfect Word Every Time

Thesaurus API.

Find synonyms and similar words for any English term. Returns a list of words with similar meanings. Perfect for writing enhancement tools, SEO content optimization, word games, and vocabulary building applications.

Get your free API key Read the docs

Free tier, no card< 200ms responses99.9% uptime SLA

GET/v1/thesauruslive

query

Response200 OK · sample

{
  "status": "ok",
  "error": null,
  "data": {
    "word": "big",
    "similarCount": 50,
    "similarWords": [
      "large",
      "ample",
      "sizable",
      "sizeable",
      "astronomic",
      "astronomical",
      "galactic",
      "bigger",
      "larger",
      "biggest",
      "greatest",
      "largest",
      "biggish",
      "largish",
      "blown-up",
      "enlarged",
      "bouffant",
      "puffy",
      "bulky",
      "capacious",
      "colossal",
      "prodigious",
      "stupendous",
      "cosmic",
      "deep",
      "double",
      "elephantine",
      "gargantuan",
      "giant",
      "jumbo",
      "enormous",
      "tremendous",
      "epic",
      "heroic",
      "larger-than-life",
      "extensive",
      "extended",
      "gigantic",
      "mammoth",
      "great",
      "hulking",
      "hulky",
      "huge",
      "immense",
      "vast",
      "Brobdingnagian",
      "humongous",
      "banging",
      "thumping",
      "whopping"
    ]
  }
}

Sample response · verify to run one live call, no signup

How it works

Thesaurus API

Comprehensive synonyms with semantic similarity scores
Antonyms for finding opposite meanings
Related words and semantic connections
Context and register information for proper usage

1
Send one request
A single authenticated GET with the location you care about — no SDK required.
```
GET /v1/thesaurus?query=…
x-api-key: your_key
```
2
We do the aggregation
Each request pulls from multiple upstream sources and computes the derived fields for you.
3
Get clean JSON back
One structured object, typically under 200 ms — ready to render.
```
{ word, similarCount, similarWords, … }
```

The response

Everything in a single call.

/v1/thesaurusapplication/json

word"big"

similarCount50

similarWordsarray of 50

Use cases

What developers build with it.

Real applications shipping on this endpoint today — each with the numbers that made it worth wiring up.

See every use case

Writing Enhancement Tools

Integrate our Thesaurus API to suggest synonyms in real-time. Highlight repeated words and offer one-click replacements. Use similarity scores to ensure suggestions maintain the intended meaning.

Reduce word repetition automaticallySuggest contextually appropriate alternativesMaintain meaning with similarity scores

Better writingwith varied vocabulary

Faster editingwith instant suggestions

Context-awaresynonym matching

SEO & Content Optimization

Use synonyms to naturally vary keyword usage. Include related words to demonstrate topical authority. The semantic similarity scores help maintain relevance while diversifying language.

Avoid keyword stuffing penaltiesCover semantic topics comprehensivelyImprove content naturalness

Naturalkeyword variation

Semantictopic coverage

Better SEOwithout stuffing

Vocabulary Learning Apps

Present new vocabulary with their synonyms and antonyms. Show word relationships to build semantic networks in learners' minds. Use antonym pairs for contrast-based learning.

Build vocabulary through word relationshipsCreate stronger memory associationsLearn antonym pairs together

Faster learningthrough relationships

Better retentionwith word networks

Nuanced understandingvia similarity scores

Start coding

Call it in your language.

Copy a working request, or install a typed SDK. Same endpoint, same key.

const res = await fetch("https://api.apiverve.com/v1/thesaurus?word=big", {
  headers: { "x-api-key": "YOUR_API_KEY" },
});
const { data } = await res.json();
console.log(data);

Included in your key

One subscription, the whole find the perfect word every time stack.

Every related API ships with your key — no separate plans, no extra keys, one bill.

See pricing

8APIs in this bundle

99.9%uptime SLA

The bundle

thesaurusYou’re heredictionary wordpronunciation wordrhymes sentimentanalysis spellchecker randomwords textsummarizer

No code required

Wire it into the tools you already run.

Ready-made recipes for Zapier, Make, and n8n — trigger on an event, and the data lands where your team works.

Google Sheets

Find synonyms for words in a column

WhenNew row added

ThenLook up word → write similarWords to adjacent column

Slack

Find synonyms on demand in Slack

WhenSlash command or keyword detected

ThenLook up word → post similarWords to channel

Airtable

Auto-populate synonyms in vocabulary base

WhenNew record created

ThenLook up word → populate similarWords field

Notion

Auto-fill synonyms in vocabulary database

WhenNew database item created

ThenLook up word → update similarWords property

Salesforce

Add synonym data to content planning records

WhenNew record created

ThenLook up term → update similarWords field

GitHub

Suggest word alternatives in documentation PRs

WhenNew pull request opened

ThenLook up key terms → add comment with similarWords

Browse all integrations

Learn

Understand the data behind the API.

Understanding Synonyms & Antonyms

Learn how synonyms and antonyms work and their role in language.

Using a Thesaurus Effectively

Best practices for finding and using word alternatives.

Questions about the API

How many synonyms do you return per word?

We typically return 10-20 synonyms per word, ranked by semantic similarity. For common words with many synonyms, we return the most relevant matches. You can also filter by part of speech to get more specific results.

Do you provide antonyms as well?

Yes, our API returns antonyms (words with opposite meanings) alongside synonyms. This is particularly useful for writing tools and vocabulary learning applications.

What is the similarity score?

The similarity score (0-1) indicates how closely a synonym matches the meaning of the input word. Higher scores mean closer semantic matches. This helps you choose the most appropriate alternative.

Are synonyms filtered by part of speech?

Yes, we return the part of speech for the input word and match synonyms accordingly. This ensures you get relevant alternatives - adjective synonyms for adjectives, verb synonyms for verbs, etc.

Can I use this for SEO content optimization?

Absolutely. Use synonyms to avoid keyword stuffing while maintaining topical relevance. The related words feature helps you cover semantic topics comprehensively for better search visibility.

How do related words differ from synonyms?

Synonyms have nearly identical meanings. Related words are semantically connected but may have different meanings - for "happy," related words include "happiness" (noun form), "joy" (related concept), etc.

Is this suitable for academic writing tools?

Yes, our thesaurus helps writers vary their vocabulary and find more precise terms. The context information helps ensure formal language for academic contexts.

Do you support multiple languages?

Currently, our Thesaurus API focuses on English. We plan to add support for additional languages in the future. Contact us for specific language requirements.