rhyming slang vs lingo

rhyming slang and lingo both are nouns.

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

As nouns, lingo is a hypernym of rhyming slang; that is, lingo is a word with a broader meaning than rhyming slang:

rhyming slang: slang that replaces words with rhyming words or expressions and then typically omits the rhyming component
lingo: a characteristic language of a particular group (as among thieves)

Other hypernyms of rhyming slang include argot, cant, jargon, patois, slang, vernacular.

rhyming slang (noun)	lingo (noun)
slang that replaces words with rhyming words or expressions and then typically omits the rhyming component	a characteristic language of a particular group (as among thieves)