knife vs injure

knife is a noun but injure is not a noun.

Word	Noun	Adjective	Verb	Adverb
knife	Yes	No	Yes	No
injure	No	No	Yes	No

As verbs, injure is a hypernym of knife; that is, injure is a word with a broader meaning than knife:

Other hypernyms of knife include wound.

knife (noun)	injure (noun)
edge tool used as a cutting instrument; has a pointed blade with a sharp edge and a handle
a weapon with a handle and blade with a sharp point
any long thin projection that is transient

knife (verb)	injure (verb)
use a knife on	cause injuries or bodily harm to
	cause damage or affect negatively
	hurt the feelings of