shave vs knock off

shave is a noun but knock off is not a noun.

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

As verbs, shave and knock off are synonyms defined as:

shave (noun)	knock off (noun)
the act of removing hair with a razor

shave (verb)	knock off (verb)
remove body hair with a razor	stop pursuing or acting
touch the surface of lightly	get rid of (someone who may be a threat) by killing
cut closely	write quickly
cut or remove with or as if with a plane	take by theft
make shavings of or reduce to shavings	cut the price of
cut the price of