repay vs pay

repay is not a noun while pay is a noun.

Word	Noun	Adjective	Verb	Adverb
repay	No	No	Yes	No
pay	Yes	No	Yes	No

As verbs, pay is a hypernym of repay; that is, pay is a word with a broader meaning than repay:

As verbs, pay is a hyponym of repay; that is, pay is a word with a more specific, narrower meaning than repay:

repay (noun)	pay (noun)
	something that remunerates

repay (verb)	pay (verb)
answer back	dedicate
pay back	bear (a cost or penalty), in recompense for some action
make repayment for or return something	convey, as of a compliment, regards, attention, etc.; bestow
act or give recompense in recognition of someone's behavior or actions	give money, usually in exchange for goods or services
	bring in
	do or give something to somebody in return
	cancel or discharge a debt
	make a compensation for
	discharge or settle
	render
	be worth it