knife vs peak

knife and peak both are nouns.

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

knife (noun)	peak (noun)
edge tool used as a cutting instrument; has a pointed blade with a sharp edge and a handle	a brim that projects to the front to shade the eyes
a weapon with a handle and blade with a sharp point	the top or extreme point of something (usually a mountain or hill)
any long thin projection that is transient	the highest point (of something)
	the most extreme possible amount or value
	a V shape
	the highest level or degree attainable; the highest stage of development
	the period of greatest prosperity or productivity

knife (verb)	peak (verb)
use a knife on	to reach the highest point; attain maximum intensity, activity