brown rat vs depreciation

brown rat and depreciation both are nouns.

Word	Noun	Adjective	Verb	Adverb
brown rat	Yes	No	No	No
depreciation	Yes	No	No	No

brown rat (noun)	depreciation (noun)
common domestic rat; serious pest worldwide	a decrease in price or value
	a communication that belittles somebody or something
	decrease in value of an asset due to obsolescence or use