sleep with vs couple

sleep with is not a noun while couple is a noun.

Word	Noun	Adjective	Verb	Adverb
sleep with	No	No	Yes	No
couple	Yes	No	Yes	No

As verbs, couple is a hypernym of sleep with; that is, couple is a word with a broader meaning than sleep with:

Other hypernyms of sleep with include copulate, mate, pair.

sleep with (noun)	couple (noun)
	a pair who associate with one another
	a pair of people who live together
	(physics) something joined by two equal and opposite forces that act along parallel lines
	two items of the same kind
	a small indefinite number

sleep with (verb)	couple (verb)
have sexual intercourse with	engage in sexual intercourse
	link together
	bring two objects, ideas, or people together
	form a pair or pairs