hump vs nub

hump and nub both are nouns.

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

As nouns, nub is a hyponym of hump; that is, nub is a word with a more specific, narrower meaning than hump:

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

Other hyponyms of hump include frontal eminence, occipital protuberance, belly, caput, mogul, nubble, snag, wart.

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

hump (verb)	nub (verb)
have sexual intercourse with
round one's back by bending forward and drawing the shoulders forward