argot vs vernacular

argot and vernacular both are nouns.

Word	Noun	Adjective	Verb	Adverb
argot	Yes	No	No	No
vernacular	Yes	Yes	No	No

As nouns, argot and vernacular are synonyms defined as:

argot and vernacular: a characteristic language of a particular group (as among thieves)

Other synonyms of argot include cant, jargon, lingo, patois, slang.

argot (noun)	vernacular (noun)
a characteristic language of a particular group (as among thieves)	the everyday speech of the people (as distinguished from literary language)
	a characteristic language of a particular group (as among thieves)

argot (adjective)	vernacular (adjective)
	being or characteristic of or appropriate to everyday language