nub

Noun
  1. A small lump or protuberance (synset 113918315)
  2. A small piece (synset 109397558)
    "a nub of coal"; "a stub of a pencil"
  3. The choicest or most essential or most vital part of some idea or experience (synset 105929717)
    "the gist of the prosecutor's argument"; "the heart and soul of the Republican Party"; "the nub of the story"

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