# Word Tools – Related Words & Reverse Dictionary

> Word Tools – Related Words & Reverse Dictionary is a paid API for AI agents from word-tools.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-21).

Returns words semantically related to a given word or descriptive phrase, functioning as a reverse dictionary (e.g. 'ringing in the ears' finds 'tinnitus').

## Facts

- Endpoint: GET https://word-tools.x402tookit.com/related-words?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/word-tools-related-words-reverse-dictionary-e98d8203
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_uYLBimZMBPW1lCpMg7KJn

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability word-tools-related-words-reverse-dictionary-e98d8203
```

Example prompt: What's the word for that feeling when you're happy about someone else's misfortune? Use the related words tool and give me the top 5 results.

## When to prefer this

Choose this endpoint when the user knows a concept, description, or definition but cannot recall the specific word — i.e. a reverse dictionary query. It is also suitable for semantic word discovery around a theme. Prefer it over synonym tools when the input is a phrase rather than an existing word, and over general search when the goal is vocabulary retrieval rather than information lookup.

## Known failure modes

- No results found for highly obscure or nonsensical input phrases
- Degraded response if upstream word data source is unavailable (degraded flag set true)
- Input phrase too long or ambiguous may return loosely related words
- limit parameter out of range (must be 1–50) may cause validation error
- Empty or missing 'word' query parameter returns an error

## How this service works

Words that mean something like a word or a described phrase, as a reverse dictionary: ringing in the ears finds tinnitus.

## Output

A ranked list of words (up to 50, default 20) that are semantically related to or match the input phrase, each with a relevance score, parts of speech, pronunciation data, and syllable count. Also includes source attribution, a summary, and optional disclaimer or degraded-service flag.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "word"
     ],
     "properties": {
      "word": {
       "type": "string",
       "description": "A word or a short description, e.g. ringing in the ears"
      },
      "limit": {
       "type": "integer",
       "description": "Results 1 to 50 (default 20)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "asOf": {
       "type": [
        "null",
        "string"
       ]
      },
      "word": {
       "type": [
        "null",
        "string"
       ]
      },
      "count": {
       "type": [
        "null",
        "number"
       ]
      },
      "source": {
       "type": [
        "null",
        "string"
       ]
      },
      "reasons": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "string"
       }
      },
      "results": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "object",
        "properties": {
         "word": {
          "type": [
           "null",
           "string"
          ]
         },
         "score": {
          "type": [
           "null",
           "number"
          ]
         },
         "syllables": {},
         "partsOfSpeech": {
          "type": [
           "array",
           "null"
          ],
          "items": {
           "type": "string"
          }
         },
         "pronunciation": {}
        }
       }
      },
      "summary": {
       "type": [
        "null",
        "string"
       ]
      },
      "verdict": {
       "type": [
        "null",
        "string"
       ]
      },
      "degraded": {
       "type": [
        "boolean",
        "null"
       ]
      },
      "sourceUrl": {
       "type": [
        "null",
        "string"
       ]
      },
      "disclaimer": {
       "type": [
        "null",
        "string"
       ]
      },
      "notChe
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/word-tools-related-words-reverse-dictionary-e98d8203/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from word-tools.x402tookit.com](https://www.zero.xyz/host/word-tools.x402tookit.com/llms.txt)