comeback vs reply

comeback and reply both are nouns.

Word	Noun	Adjective	Verb	Adverb
comeback	Yes	No	No	No
reply	Yes	No	Yes	No

As nouns, reply is a hypernym of comeback; that is, reply is a word with a broader meaning than comeback:

comeback: a quick reply to a question or remark (especially a witty or critical one)
reply: the speech act of continuing a conversational exchange

Other hypernyms of comeback include response.

comeback (noun)	reply (noun)
return by a celebrity to some previously successful activity	the speech act of continuing a conversational exchange
a quick reply to a question or remark (especially a witty or critical one)	a statement (either spoken or written) that is made to reply to a question or request or criticism or accusation

comeback (verb)	reply (verb)
	react verbally