noun (n)

• a small sharp-pointed tip resembling a spike on a stem or leaf(noun.plant)

  Synonym:
  prickle, spikelet, spine, sticker, thorn
  

  source: wordnet30
• an awl for making small holes for brads or small screws(noun.artifact)

  Synonym:
  bradawl
  

  source: wordnet30
• One who, or that which, pricks; a pointed instrument; a sharp point; a prickle.(noun)

  source: webster1913