| API | Description | Category | Date |
|---|---|---|---|
| ProperSpell | Spelling suggesting service | Dictionary | 2011-01-10 |
| Questsin | Thesaurus and answers lookup services | Answers | 2008-12-27 |
| RhymeBrain | Online rhyming dictionary | Dictionary | 2011-05-31 |
| Rhyming | Rhyming dictionary | Dictionary | 2009-12-18 |
| Sprawk | Language Detection and Translation Service | Dictionary | 2012-11-14 |
| STANDS4 Definitions | Dictionary definition service | Dictionary | 2012-01-31 |
| Study Island Dictionary | Online dictionary service | Education | 2012-07-05 |
| UrbanDictionary | Slang dictionary lookup | Reference | 2005-10-31 |
| WebLaws | Legal glossary | Reference | 2009-12-10 |
| Wordnik | Dictionary, spelling, and other word reference | Reference | 2009-11-09 |
| WordReference | Multilingual dictionary definition service | Dictionary | 2012-01-31 |
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