fish bowl vs aquarium

fish bowl and aquarium both are nouns.

Word	Noun	Adjective	Verb	Adverb
fish bowl	Yes	No	No	No
aquarium	Yes	No	No	No

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

fish bowl: 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 fish bowl include fish tank, marine museum, bowl.

fish bowl (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