call it quits vs discontinue

call it quits and discontinue both are verbs.

Word	Noun	Adjective	Verb	Adverb
call it quits	No	No	Yes	No
discontinue	No	No	Yes	No

As verbs, discontinue is a hypernym of call it quits; that is, discontinue is a word with a broader meaning than call it quits:

Other hypernyms of call it quits include cease, give up, lay off, quit, stop.

call it quits (verb)	discontinue (verb)
stop doing what one is doing	prevent completion
	put an end to a state or an activity
	come to or be at an end