gallbladder vs vesica

gallbladder and vesica both are nouns.

Word	Noun	Adjective	Verb	Adverb
gallbladder	Yes	No	No	No
vesica	Yes	No	No	No

As nouns, vesica is a hypernym of gallbladder; that is, vesica is a word with a broader meaning than gallbladder:

gallbladder: a muscular sac attached to the liver that stores bile (secreted by the liver) until it is needed for digestion
vesica: a distensible membranous sac (usually containing liquid or gas)

Other hypernyms of gallbladder include bladder.

gallbladder (noun)	vesica (noun)
a muscular sac attached to the liver that stores bile (secreted by the liver) until it is needed for digestion	a distensible membranous sac (usually containing liquid or gas)