knife vs edge tool

knife and edge tool both are nouns.

Word	Noun	Adjective	Verb	Adverb
knife	Yes	No	Yes	No
edge tool	Yes	No	No	No

As nouns, edge tool is a hypernym of knife; that is, edge tool is a word with a broader meaning than knife:

knife: edge tool used as a cutting instrument; has a pointed blade with a sharp edge and a handle
edge tool: any cutting tool with a sharp cutting edge (as a chisel or knife or plane or gouge)

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

knife (verb)	edge tool (verb)
use a knife on