gall bladder vs vesica

gall bladder and vesica both are nouns.

Word	Noun	Adjective	Verb	Adverb
gall bladder	Yes	No	No	No
vesica	Yes	No	No	No

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

gall bladder: 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 gall bladder include bladder.

gall bladder (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)