aquarium vs marine museum

aquarium and marine museum both are nouns.

Word	Noun	Adjective	Verb	Adverb
aquarium	Yes	No	No	No
marine museum	Yes	No	No	No

As nouns, aquarium and marine museum are synonyms defined as:

aquarium and marine museum: a tank or pool or bowl filled with water for keeping live fish and underwater animals

Other synonyms of aquarium include fish tank.

aquarium (noun)	marine museum (noun)
a tank or pool or bowl filled with water for keeping live fish and underwater animals	a tank or pool or bowl filled with water for keeping live fish and underwater animals