killer vs grampus

killer and grampus both are nouns.

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

As nouns, killer and grampus are synonyms defined as:

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

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

killer (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
a difficulty that is hard to deal with	predatory black-and-white toothed whale with large dorsal fin; common in cold seas
someone who causes the death of a person or animal
the causal agent resulting in death