RE: Announcing Bot Libre 6.5 - Deep learning, conversation flows, new training editor, synonyms, sentiment

Synonyms support was added in 6.5, so is not available in 6.1.

If you enable the Wiktionary sense in your bot (even in 6.1) it will automatically import word meta data from Wiktionary (English) when it encounters new words. This includes if the word is a noun/verb/adjective and its synonyms.