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Noun: nubble  nú-bul
  1. A small lump or protuberance
    "The climbing wall was covered in nubbles for better grip";
    - nub

Derived forms: nubbles

Type of: bulge, bump, excrescence, extrusion, gibbosity, gibbousness, hump, jut, prominence, protrusion, protuberance, swelling