blub vs blubber

blub is not a noun while blubber is a noun.

Word	Noun	Adjective	Verb	Adverb
blub	No	No	Yes	No
blubber	Yes	No	Yes	No

As verbs, blub and blubber are synonyms defined as:

Other synonyms of blub include sniffle, snivel, snuffle.

blub (noun)	blubber (noun)
	excess bodily weight
	an insulating layer of fat under the skin of whales and other large marine mammals; used as a source of oil

blub (verb)	blubber (verb)
cry or whine with snuffling	cry or whine with snuffling
	utter while crying