Which word does not belong with the others?

Correct option is C

Wing, anchor, and rudder are parts of vehicles (plane/ship), but beak is a body part of an animal. Explanation of options: (a) ✘ Wing is part of a plane (b) ✘ Anchor is used in ships (c) ✔ Beak is part of a bird, not a transport part (d) ✘ Rudder is a ship control surface