grampus vs killer

grampus and killer both are nouns.

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

As nouns, grampus and killer are synonyms defined as:

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

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

grampus (noun)	killer (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	a difficulty that is hard to deal with
	someone who causes the death of a person or animal
	the causal agent resulting in death