prominence vs nub

prominence and nub both are nouns.

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

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

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

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

prominence (noun)	nub (noun)
relative importance or fame	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
the state of being prominent: widely known or eminent	a small lump or protuberance