depreciation vs pesky

depreciation is a noun but pesky is not a noun.

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

depreciation (noun)	pesky (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)	pesky (adjective)
	causing irritation or annoyance