depreciation vs dullard

depreciation and dullard both are nouns.

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

depreciation (noun)	dullard (noun)
a decrease in price or value	a person who evokes boredom
a communication that belittles somebody or something	a person who is not very bright
decrease in value of an asset due to obsolescence or use