bleb vs cyst

bleb and cyst both are nouns.

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

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

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

Other hypernyms of bleb include vesicle.

bleb (noun)	cyst (noun)
(pathology) an elevation of the skin filled with serous fluid	a small anatomically normal sac or bladderlike structure (especially one containing fluid)
	a closed sac that develops abnormally in some body structure