disparagement vs dumb

disparagement is a noun but dumb is not a noun.

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

disparagement (noun)	dumb (noun)
the act of speaking contemptuously of
a communication that belittles somebody or something

disparagement (adjective)	dumb (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