vesica vs gall bladder

vesica and gall bladder both are nouns.

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

As nouns, gall bladder is a hyponym of vesica; that is, gall bladder is a word with a more specific, narrower meaning than vesica:

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

Other hyponyms of vesica include gallbladder, urinary bladder.

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