corpulency vs blubber

corpulency and blubber both are nouns.

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

As nouns, blubber is a hypernym of corpulency; that is, blubber is a word with a broader meaning than corpulency:

Other hypernyms of corpulency include avoirdupois, fat, fatness.

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

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