marine animal vs sea animal

marine animal and sea animal both are nouns.

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

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

marine animal and sea animal: 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 creature.

marine animal (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