Which word does not belong with the others

The logic followed here is:

• Wing: This is a part of an aircraft (a vehicle) or a bird. In the context of "vehicles," it refers to an airplane wing.
• Anchor: This is a part of a ship or boat (a vehicle).
• Beak: This is a natural anatomical part of an animal (specifically a bird).
• Rudder: This is a part of a ship, boat, or aircraft (all vehicles), used for steering.

We can observe that 'wing', 'anchor', and 'rudder' are all components or parts predominantly associated with vehicles (airplanes, ships, boats).

Beak, however, is a biological feature found on animals (birds), not a part of a manufactured vehicle.

Therefore, the word that does not belong with the others is Beak.

Hence, the correct answer is "Option 3".