Rattus norvegicus vs depreciation

Rattus norvegicus and depreciation both are nouns.

Word	Noun	Adjective	Verb	Adverb
Rattus norvegicus	Yes	No	No	No
depreciation	Yes	No	No	No

Rattus norvegicus (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