bladder vs vesica

bladder and vesica both are nouns.

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

As nouns, bladder and vesica are synonyms defined as:

bladder and vesica: a distensible membranous sac (usually containing liquid or gas)

bladder (noun)	vesica (noun)
a bag that fills with air	a distensible membranous sac (usually containing liquid or gas)
a distensible membranous sac (usually containing liquid or gas)