spyhole

Từ điển WordNet v3.1 - WordNet Dictionary

noun

a hole (in a door or an oven etc) through which you can peep
• Syn:
peephole, eyehole
• Hypernyms:
hole
• Hyponyms:
judas

• Từ đồng nghĩa / Synonyms:
  peephole, eyehole