fishbowl vs aquarium

fishbowl and aquarium both are nouns.

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

As nouns, aquarium is a hypernym of fishbowl; that is, aquarium is a word with a broader meaning than fishbowl:

fishbowl: a transparent bowl in which small fish are kept
aquarium: a tank or pool or bowl filled with water for keeping live fish and underwater animals

Other hypernyms of fishbowl include fish tank, marine museum, bowl.

fishbowl (noun)	aquarium (noun)
a transparent bowl in which small fish are kept	a tank or pool or bowl filled with water for keeping live fish and underwater animals
a state of affairs in which you have no privacy