dumb vs depreciation

dumb is not a noun while depreciation is a noun.

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

dumb (noun)	depreciation (noun)
	a decrease in price or value
	a communication that belittles somebody or something
	decrease in value of an asset due to obsolescence or use

dumb (adjective)	depreciation (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