marine animal vs sea creature

marine animal and sea creature both are nouns.

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

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

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

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

marine animal (noun)	sea creature (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