vivarium vs aquarium

vivarium and aquarium both are nouns.

Word	Noun	Adjective	Verb	Adverb
vivarium	Yes	No	No	No
aquarium	Yes	No	No	No

As nouns, aquarium is a hyponym of vivarium; that is, aquarium is a word with a more specific, narrower meaning than vivarium:

vivarium: an indoor enclosure for keeping and raising living animals and plants and observing them under natural conditions
aquarium: a tank or pool or bowl filled with water for keeping live fish and underwater animals

Other hyponyms of vivarium include fish tank, marine museum, terrarium.

vivarium (noun)	aquarium (noun)
an indoor enclosure for keeping and raising living animals and plants and observing them under natural conditions	a tank or pool or bowl filled with water for keeping live fish and underwater animals