"vernacular" in the noun sense
1. slang, cant, jargon, lingo, argot, patois, vernacular
a characteristic language of a particular group (as among thieves
"they don't speak our lingo"
the everyday speech of the people (as distinguished from literary language)
"vernacular" in the adjective sense
1. common, vernacular, vulgar
being or characteristic of or appropriate to everyday language
"a vernacular term"
"the vulgar tongue of the masses"
"the technical and vulgar names for an animal species"
Source: WordNet® (An amazing lexical database of English)
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