inwardness vs nub

inwardness and nub both are nouns.

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

As nouns, inwardness and nub are synonyms defined as:

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

Other synonyms of inwardness include center, centre, core, essence, gist, heart, heart and soul, kernel, marrow, meat, nitty-gritty, pith, substance, sum.

inwardness (noun)	nub (noun)
the quality or state of being inward or internal	the choicest or most essential or most vital part of some idea or experience
preoccupation with what concerns human inner nature (especially ethical or ideological values)	a small piece
preoccupation especially with one's attitudes and ethical or ideological values	a small lump or protuberance
the choicest or most essential or most vital part of some idea or experience