lingo vs patois

lingo and patois both are nouns.

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

As nouns, lingo and patois are synonyms defined as:

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

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

lingo (noun)	patois (noun)
a characteristic language of a particular group (as among thieves)	a regional dialect of a language (especially French); usually considered substandard
	a characteristic language of a particular group (as among thieves)