grampus vs orca

grampus and orca both are nouns.

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

As nouns, grampus and orca are synonyms defined as:

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

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

grampus (noun)	orca (noun)
slaty-grey blunt-nosed dolphin common in northern seas	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