dumb vs derogation

dumb is not a noun while derogation is a noun.

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

dumb (noun)	derogation (noun)
	(law) the partial taking away of the effectiveness of a law; a partial repeal or abolition of a law
	a communication that belittles somebody or something

dumb (adjective)	derogation (adjective)
slow to learn or understand; lacking intellectual acuity
unable to speak because of hereditary deafness
temporarily incapable of speaking
lacking the power of human speech