bleb vs bulla

bleb and bulla both are nouns.

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

As nouns, bleb and bulla are synonyms defined as:

bleb and bulla: (pathology) an elevation of the skin filled with serous fluid

Other synonyms of bleb include blister.

bleb (noun)	bulla (noun)
(pathology) an elevation of the skin filled with serous fluid	the round leaden seal affixed to a papal bull
	(pathology) an elevation of the skin filled with serous fluid