knock off vs discontinue

knock off and discontinue both are verbs.

Word	Noun	Adjective	Verb	Adverb
knock off	No	No	Yes	No
discontinue	No	No	Yes	No

As verbs, discontinue is a hypernym of knock off; that is, discontinue is a word with a broader meaning than knock off:

Other hypernyms of knock off include cease, give up, lay off, quit, stop.

knock off (verb)	discontinue (verb)
stop pursuing or acting	prevent completion
get rid of (someone who may be a threat) by killing	put an end to a state or an activity
write quickly	come to or be at an end
take by theft
cut the price of