noun (n)

• a small node(noun.body)

  source: wordnet30
• small rounded wartlike protuberance on a plant(noun.plant)

  Synonym:
  tubercle
  

  source: wordnet30
• (mineralogy) a small rounded lump of mineral substance (usually harder than the surrounding rock or sediment)(noun.object)

  source: wordnet30
• A rounded mass or irregular shape; a little knot or lump.(noun)

  source: webster1913