bleb vs vesicle

bleb and vesicle both are nouns.

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

As nouns, vesicle is a hypernym of bleb; that is, vesicle is a word with a broader meaning than bleb:

bleb: (pathology) an elevation of the skin filled with serous fluid
vesicle: a small anatomically normal sac or bladderlike structure (especially one containing fluid)

Other hypernyms of bleb include cyst.

bleb (noun)	vesicle (noun)
(pathology) an elevation of the skin filled with serous fluid	a small anatomically normal sac or bladderlike structure (especially one containing fluid)