derogation vs knocker

derogation and knocker both are nouns.

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

derogation (noun)	knocker (noun)
(law) the partial taking away of the effectiveness of a law; a partial repeal or abolition of a law	a device (usually metal and ornamental) attached by a hinge to a door
a communication that belittles somebody or something	either of two soft fleshy milk-secreting glandular organs on the chest of a woman
	one who disparages or belittles the worth of something
	a person who knocks (as seeking to gain admittance)
	(Yiddish) a big shot who knows it and acts that way; a boastful immoderate person