have it off vs pair

have it off is not a noun while pair is a noun.

Word	Noun	Adjective	Verb	Adverb
have it off	No	No	Yes	No
pair	Yes	No	Yes	No

As verbs, pair is a hypernym of have it off; that is, pair is a word with a broader meaning than have it off:

Other hypernyms of have it off include copulate, couple, mate.

have it off (noun)	pair (noun)
	two people considered as a unit
	a set of two similar things considered as a unit
	a poker hand with 2 cards of the same value
	two items of the same kind

have it off (verb)	pair (verb)
have sexual intercourse with	engage in sexual intercourse
	bring two objects, ideas, or people together
	arrange in pairs
	occur in pairs
	form a pair or pairs