ass vs carnal knowledge

ass and carnal knowledge both are nouns.

Word	Noun	Adjective	Verb	Adverb
ass	Yes	No	No	No
carnal knowledge	Yes	No	No	No

As nouns, carnal knowledge is a hypernym of ass; that is, carnal knowledge is a word with a broader meaning than ass:

ass: slang for sexual intercourse
carnal knowledge: sexual activity between individuals, especially the insertion of a man's penis into a woman's vagina until orgasm and ejaculation occur

ass (noun)	carnal knowledge (noun)
slang for sexual intercourse	sexual activity between individuals, especially the insertion of a man's penis into a woman's vagina until orgasm and ejaculation occur
hardy and sure-footed animal smaller and with longer ears than the horse
the fleshy part of the human body that you sit on
a pompous fool