#1
nub n. [
nubble] a small lump or protuberance
. wn #2
nub n. [
stub] a small piece; "a nub of coal"; "a stub of a pencil"
. wn #3
nub n. [
kernel, substance, core, center, centre, essence, gist, heart, heart and soul, inwardness, marrow, meat, pith, sum, nitty-gritty] the choicest or most essential or most vital part of some idea or experience; "the gist of the prosecutor's argument"; "the heart and soul of the Republican Party"; "the nub of the story"
. wn