sea creature vs sea animal

sea creature and sea animal both are nouns.

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

As nouns, sea creature and sea animal are synonyms defined as:

sea creature and sea animal: any of numerous animals inhabiting the sea including e.g. fishes and molluscs and many mammals

Other synonyms of sea creature include marine animal, marine creature.

sea creature (noun)	sea animal (noun)
any of numerous animals inhabiting the sea including e.g. fishes and molluscs and many mammals	any of numerous animals inhabiting the sea including e.g. fishes and molluscs and many mammals