depreciation vs Rattus norvegicus

depreciation and Rattus norvegicus both are nouns.

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

depreciation (noun)	Rattus norvegicus (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