[sheraz]

Upvoted, and I'll pile on. Wordnet [1] already has addons for Postgres.

[1] - https://github.com/taotetek/wordnet-postgres

[gojomo]

Can you clarify... does this addon simply store the Wordnet data inside Postgres, or actually let the postgres full-text search do query-expansion-to-synonyms?

[sheraz]

Sure. There are functions in this package. This link is better, which explains how the functions will work.

http://wnsqlbuilder.sourceforge.net/sql.html