nub vs bulge

nub and bulge both are nouns.

Word	Noun	Adjective	Verb	Adverb
nub	Yes	No	No	No
bulge	Yes	No	Yes	No

As nouns, bulge is a hypernym of nub; that is, bulge is a word with a broader meaning than nub:

nub: a small lump or protuberance
bulge: something that bulges out or is protuberant or projects from its surroundings

nub (noun)	bulge (noun)
the choicest or most essential or most vital part of some idea or experience	something that bulges out or is protuberant or projects from its surroundings
a small piece
a small lump or protuberance

nub (verb)	bulge (verb)
	swell or protrude outwards
	cause to bulge or swell outwards
	bulge outward
	bulge out; form a bulge outward, or be so full as to appear to bulge