depreciation vs plaguy

depreciation is a noun but plaguy is not a noun.

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

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

depreciation (adverb)	plaguy (adverb)
	in a pernicious or annoying manner