sea wolf vs dolphin

sea wolf and dolphin both are nouns.

Word	Noun	Adjective	Verb	Adverb
sea wolf	Yes	No	No	No
dolphin	Yes	No	No	No

As nouns, dolphin is a hypernym of sea wolf; that is, dolphin is a word with a broader meaning than sea wolf:

sea wolf: predatory black-and-white toothed whale with large dorsal fin; common in cold seas
dolphin: any of various small toothed whales with a beaklike snout; larger than porpoises

sea wolf (noun)	dolphin (noun)
predatory black-and-white toothed whale with large dorsal fin; common in cold seas	any of various small toothed whales with a beaklike snout; larger than porpoises
	large slender food and game fish widely distributed in warm seas (especially around Hawaii)