| Sl No. | Name | URL | 
| 1. | NASA Thesaurus | http://www.sti.nasa.gov/thesfrm1.htm | 
| 2. | Roget's Thesaurus | http://machaut.uchicago.edu/ | 
| 3. | The CMU Pronouncing Dictionary (Carnegie Mellon) | http://www.speech.cs.cmu.edu/cgi-bin/cmudict | 
| 4. | Controlling your language - links to metadata vocabularies | http://www.jiscdigitalmedia.ac.uk/crossmedia/advice/controlling-your-language- links-to-metadata-vocabularies/ | 
| 5. | WWWebster Thesaurus (Merriam Webster) | http://www.merriam-webster.com/thesaurus.htm | 
| 6. | WordNet Vocabulary --Provides homonyms, synonyms, and coordinate terms. Helper | http://poets.notredame.ac.jp/cgi-bin/wn | 
| 7. | Infoplease thesaurus | http://www.infoplease.com/thesaurus | 
| 8. | The Semantic Rhyming Dictionary --Use for rhymes, to spell check, to find synonyms, etc.
 | http://www.rhymezone.com/ |