lingo vs slang

lingo and slang both are nouns.

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

As nouns, lingo and slang are synonyms defined as:

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

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

lingo (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