# List related words

`GET https://api.unique.domains/v1/words/{word}/related`

A word's synonyms then related words, closest first, with their open names.

Synonyms (levels 0 and 1) then related words (level 2), closest first. Neighbours with a deny class are left out.

- Access: A member key (Founder or Investor) or a paid RapidAPI subscription to this API.
- Billing: One call.
- Plan: Investor plan. A Founder key answers 403 `plan_required`.
- Formats: JSON
- API: Word Intelligence API

## Request

| Field | Type | Needs | Where | Description |
| --- | --- | --- | --- | --- |
| `word` | string | Required | Path | The catalog slug, the word, or `wrd_<id>`. |
| `limit` | integer | Optional | Query | Rows, 1 to 50. |
| `fields` | string | Optional | Query | Comma-separated top-level keys to keep; an unknown key answers 400 `unsupported_field`. |

## Sample request

```bash
curl -X GET "https://api.unique.domains/v1/words/harbor/related" \
  -H "Authorization: Bearer YOUR_MEMBER_KEY"
```

## Response

| Field | Type | Description |
| --- | --- | --- |
| `word` | string |  |
| `slug` | string \| null |  |
| `relation` | string |  |
| `openNames` | integer \| null | Open to register plus for sale; null: not counted yet. |

## Errors

| Code | Status | What it means |
| --- | --- | --- |
| [`validation_failed`](https://unique.domains/api/problems/validation_failed) | 400 | A value is not valid |
| [`not_found`](https://unique.domains/api/problems/not_found) | 404 | Not found |
| [`rate_limited`](https://unique.domains/api/problems/rate_limited) | 429 | Too many requests |
| [`internal`](https://unique.domains/api/problems/internal) | 500 | Unexpected error |

## Example answer

200, application/json

```json
{
  "data": [
    {
      "word": "port",
      "slug": "port",
      "relation": "synonym",
      "openNames": 6
    }
  ],
  "meta": {
    "asOf": "2026-11-05T08:00:00Z",
    "cursor": null,
    "limit": null
  },
  "links": {
    "self": "https://api.unique.domains/v1/words/harbor/related",
    "next": null,
    "register": null,
    "product": null,
    "dataset": null
  }
}
```

API status: https://uniquedomains.instatus.com

Full reference: https://unique.domains/api