discontinue vs quit

discontinue and quit both are verbs.

Word	Noun	Adjective	Verb	Adverb
discontinue	No	No	Yes	No
quit	No	No	Yes	No

As verbs, discontinue and quit are synonyms defined as:

Other synonyms of discontinue include cease, give up, lay off, stop.

discontinue (verb)	quit (verb)
prevent completion	give up in the face of defeat of lacking hope; admit defeat
put an end to a state or an activity	go away or leave
come to or be at an end	turn away from; give up
	give up or retire from a position
	put an end to a state or an activity