depreciation vs brown rat

depreciation and brown rat both are nouns.

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

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