depreciation vs gadfly

depreciation and gadfly both are nouns.

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

depreciation (noun)	gadfly (noun)
a decrease in price or value	any of various large flies that annoy livestock
a communication that belittles somebody or something	a persistently annoying person
decrease in value of an asset due to obsolescence or use