sea animal vs animal

sea animal and animal both are nouns.

Word	Noun	Adjective	Verb	Adverb
sea animal	Yes	No	No	No
animal	Yes	Yes	No	No

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

sea animal: any of numerous animals inhabiting the sea including e.g. fishes and molluscs and many mammals
animal: a living organism characterized by voluntary movement

Other hypernyms of sea animal include animate being, beast, brute, creature, fauna.

sea animal (noun)	animal (noun)
any of numerous animals inhabiting the sea including e.g. fishes and molluscs and many mammals	a living organism characterized by voluntary movement

sea animal (adjective)	animal (adjective)
	marked by the appetites and passions of the body