nub Synonyms

core essence heart kernel gist substance sum nubbin point pith nitty-gritty inwardness nubble heart and soul knob stub lump marrow meat knot bump center centre protuberance crux bottom line root stump sum and substance spirit spikelet spike quintessence main point rationalness n00b decisive point substance of the matter soul speed bump midpoint newbie center of gravity nuts and bolts bossiness central idea nerve center Central Point upshot swelling