Related Clues:

• Peek in someone's medicine cabinet, perhaps
• Nose
• One who peeps, perhaps
• Pesky neighbor
• Poke (around)
• Prying sort
• Be too inquisitive
• Eavesdrop or eavesdropper
• Snoopy sort
• One who may bug you
• Get your nose into someone's business
• Spy, e.g.
• Nosy type
• Nero Wolfe, for one
• Stick one's nose in