vesica vs gallbladder

vesica and gallbladder both are nouns.

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

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

vesica: a distensible membranous sac (usually containing liquid or gas)
gallbladder: 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 gall bladder, urinary bladder.

vesica (noun)	gallbladder (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