Orcinus orca vs orca

Orcinus orca and orca both are nouns.

Word	Noun	Adjective	Verb	Adverb
Orcinus orca	Yes	No	No	No
orca	Yes	No	No	No

As nouns, Orcinus orca and orca are synonyms defined as:

Orcinus orca and orca: predatory black-and-white toothed whale with large dorsal fin; common in cold seas

Other synonyms of Orcinus orca include grampus, killer, killer whale, sea wolf.

Orcinus orca (noun)	orca (noun)
predatory black-and-white toothed whale with large dorsal fin; common in cold seas	predatory black-and-white toothed whale with large dorsal fin; common in cold seas