noun (n)

• a hole (in a door or an oven etc) through which you can peep(noun.artifact)

  Synonym:
  peephole, spyhole
  

  source: wordnet30
• a small hole (usually round and finished around the edges) in cloth or leather for the passage of a cord or hook or bar(noun.artifact)

  Synonym:
  eyelet
  

  source: wordnet30
• A circular opening to recive a hook, cord, ring, or rope; an eyelet.(noun)

  source: webster1913