nub vs sum

nub and sum both are nouns.

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

As nouns, nub and sum are synonyms defined as:

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

nub (noun)	sum (noun)
the choicest or most essential or most vital part of some idea or experience	the whole amount
a small piece	the choicest or most essential or most vital part of some idea or experience
a small lump or protuberance	a quantity obtained by the addition of a group of numbers
	the final aggregate
	a set containing all and only the members of two or more given sets
	a quantity of money

nub (verb)	sum (verb)
	determine the sum of
	be a summary of