sea creature vs animate being

sea creature and animate being both are nouns.

Word	Noun	Adjective	Verb	Adverb
sea creature	Yes	No	No	No
animate being	Yes	No	No	No

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

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

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

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