pith vs nub

pith and nub both are nouns.

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

As nouns, pith and nub are synonyms defined as:

pith and nub: the choicest or most essential or most vital part of some idea or experience

pith (noun)	nub (noun)
the choicest or most essential or most vital part of some idea or experience	the choicest or most essential or most vital part of some idea or experience
soft spongelike central cylinder of the stems of most flowering plants	a small piece
	a small lump or protuberance

pith (verb)	nub (verb)
remove the pith from (a plant)