Explanation:

- Option 1: "Puddel"

- The correct spelling is "puddle."

- It refers to a small pool of liquid, usually water, typically collected on the ground.

- Option 2: "Pigeon"

- This word is spelled correctly.

- It's a type of bird known for its ability to fly long distances and often found in urban areas.

- Option 3: "Pillion"

- The spelling here is correct.

- It refers to the seat behind the main seat on a motorcycle or bicycle for a passenger.

- Option 4: "Pioneer"

- This is also spelled correctly.

- It refers to someone who is among the first to explore or settle a new area or field.

Option 1: "Puddel" is incorrect. The correct spelling is "puddle."