depreciation vs dumb

depreciation is a noun but dumb is not a noun.

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

depreciation (noun)	dumb (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

depreciation (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