knock out vs get rid of

knock out and get rid of both are verbs.

Word	Noun	Adjective	Verb	Adverb
knock out	No	No	Yes	No
get rid of	No	No	Yes	No

As verbs, get rid of is a hypernym of knock out; that is, get rid of is a word with a broader meaning than knock out:

Other hypernyms of knock out include do away with, eliminate, extinguish.

knock out (verb)	get rid of (verb)
destroy or break forcefully	terminate, end, or take out
eliminate	dispose of
empty (as of tobacco) by knocking out	do away with
knock unconscious or senseless
overwhelm with admiration