rhyming slang vs jargon

rhyming slang and jargon both are nouns.

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

As nouns, jargon is a hypernym of rhyming slang; that is, jargon 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
jargon: a characteristic language of a particular group (as among thieves)

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

rhyming slang (noun)	jargon (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)
	specialized technical terminology characteristic of a particular subject
	a colorless (or pale yellow or smoky) variety of zircon