roof rat vs Rattus rattus

roof rat and Rattus rattus both are nouns.

Word	Noun	Adjective	Verb	Adverb
roof rat	Yes	No	No	No
Rattus rattus	Yes	No	No	No

As nouns, roof rat and Rattus rattus are synonyms defined as:

roof rat and Rattus rattus: common household pest originally from Asia that has spread worldwide

Other synonyms of roof rat include black rat.

roof rat (noun)	Rattus rattus (noun)
common household pest originally from Asia that has spread worldwide	common household pest originally from Asia that has spread worldwide