Rattus rattus vs black rat

Rattus rattus and black rat both are nouns.

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

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

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

Other synonyms of Rattus rattus include roof rat.

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