cyst vs vesicle

cyst and vesicle both are nouns.

Word	Noun	Adjective	Verb	Adverb
cyst	Yes	No	No	No
vesicle	Yes	No	No	No

As nouns, cyst and vesicle are synonyms defined as:

cyst and vesicle: a small anatomically normal sac or bladderlike structure (especially one containing fluid)

cyst (noun)	vesicle (noun)
a small anatomically normal sac or bladderlike structure (especially one containing fluid)	a small anatomically normal sac or bladderlike structure (especially one containing fluid)
a closed sac that develops abnormally in some body structure