marine museum vs storage tank

marine museum and storage tank both are nouns.

Word	Noun	Adjective	Verb	Adverb
marine museum	Yes	No	No	No
storage tank	Yes	No	No	No

As nouns, storage tank is a hypernym of marine museum; that is, storage tank is a word with a broader meaning than marine museum:

marine museum: a tank or pool or bowl filled with water for keeping live fish and underwater animals
storage tank: a large (usually metallic) vessel for holding gases or liquids

Other hypernyms of marine museum include tank, vivarium.

marine museum (noun)	storage tank (noun)
a tank or pool or bowl filled with water for keeping live fish and underwater animals	a large (usually metallic) vessel for holding gases or liquids