argot vs lingo

argot and lingo both are nouns.

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

As nouns, argot and lingo are synonyms defined as:

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

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

argot (noun)	lingo (noun)
a characteristic language of a particular group (as among thieves)	a characteristic language of a particular group (as among thieves)