call it a day vs quit

call it a day and quit both are verbs.

Word	Noun	Adjective	Verb	Adverb
call it a day	No	No	Yes	No
quit	No	No	Yes	No

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

Other hypernyms of call it a day include cease, discontinue, give up, lay off, stop.

call it a day (verb)	quit (verb)
stop doing what one is doing	give up in the face of defeat of lacking hope; admit defeat
	go away or leave
	turn away from; give up
	give up or retire from a position
	put an end to a state or an activity