Orcinus orca vs grampus

Orcinus orca and grampus both are nouns.

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

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

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

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

Orcinus orca (noun)	grampus (noun)
predatory black-and-white toothed whale with large dorsal fin; common in cold seas	slaty-grey blunt-nosed dolphin common in northern seas
	predatory black-and-white toothed whale with large dorsal fin; common in cold seas