knocker vs knock

knocker and knock both are nouns.

Word	Noun	Adjective	Verb	Adverb
knocker	Yes	No	No	No
knock	Yes	No	Yes	No

knocker (noun)	knock (noun)
a device (usually metal and ornamental) attached by a hinge to a door	the act of hitting vigorously
either of two soft fleshy milk-secreting glandular organs on the chest of a woman	negative criticism
one who disparages or belittles the worth of something	a vigorous blow
a person who knocks (as seeking to gain admittance)	the sound of knocking (as on a door or in an engine or bearing)
(Yiddish) a big shot who knows it and acts that way; a boastful immoderate person	a bad experience

knocker (verb)	knock (verb)
	find fault with; express criticism of; point out real or perceived flaws
	knock against with force or violence
	rap with the knuckles
	deliver a sharp blow or push
	make light, repeated taps on a surface
	sound like a car engine that is firing too early