Nouns

(n)slang, cant, jargon, lingo, argot, patois, vernaculara characteristic language of a particular group (as among thieves)“they don't speak our lingo”
(n)vernacularthe everyday speech of the people (as distinguished from literary language)

Adjectives

(s)common, vernacular, vulgarbeing or characteristic of or appropriate to everyday language“common parlance”, “a vernacular term”, “vernacular speakers”, “the vulgar tongue of the masses”, “the technical and vulgar names for an animal species”