roll in the hay vs couple

roll in the hay and couple both are nouns.

Word	Noun	Adjective	Verb	Adverb
roll in the hay	Yes	No	Yes	No
couple	Yes	No	Yes	No

As verbs, couple is a hypernym of roll in the hay; that is, couple is a word with a broader meaning than roll in the hay:

Other hypernyms of roll in the hay include copulate, mate, pair.

roll in the hay (noun)	couple (noun)
slang for sexual intercourse	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

roll in the hay (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