aquarium vs fishbowl

aquarium and fishbowl both are nouns.

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

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

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

Other hyponyms of aquarium include fish bowl, goldfish bowl.

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