fifth columnist vs depreciation

fifth columnist and depreciation both are nouns.

Word	Noun	Adjective	Verb	Adverb
fifth columnist	Yes	No	No	No
depreciation	Yes	No	No	No

fifth columnist (noun)	depreciation (noun)
a member of a clandestine subversive organization who tries to help a potential invader	a decrease in price or value
	a communication that belittles somebody or something
	decrease in value of an asset due to obsolescence or use