piece of ass vs intercourse

piece of ass and intercourse both are nouns.

Word	Noun	Adjective	Verb	Adverb
piece of ass	Yes	No	No	No
intercourse	Yes	No	No	No

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

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

piece of ass (noun)	intercourse (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
	communication between individuals