argot vs slang

argot and slang both are nouns.

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

As nouns, argot and slang are synonyms defined as:

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

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

argot (noun)	slang (noun)
a characteristic language of a particular group (as among thieves)	a characteristic language of a particular group (as among thieves)
	informal language consisting of words and expressions that are not considered appropriate for formal occasions; often vituperative or vulgar