nub
1. [ noun ] a small piece
Synonyms: stub
Examples:

"a nub of coal" or "a stub of a pencil"

Related terms: part nubbin
2. [ noun ] a small lump or protuberance
Synonyms: nubble
Related terms: bulge
3. [ noun ] the choicest or most essential or most vital part of some idea or experience
Synonyms: center substance essence core heart sum heart_and_soul marrow pith meat inwardness nitty-gritty gist kernel
Examples:

: "the gist of the prosecutor's argument" "the heart and soul of the Republican Party" "the nub of the story"

Related terms: content stuff hypostasis haecceity bare_bones quintessence summate
Similar spelling:   nubia
  nubby