marine creature vs animal

marine creature and animal both are nouns.

Word	Noun	Adjective	Verb	Adverb
marine creature	Yes	No	No	No
animal	Yes	Yes	No	No

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

marine creature: 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 marine creature include animate being, beast, brute, creature, fauna.

marine creature (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

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