Four words have been given, out of which three are alike in some manner and one is different. Select the odd one.

Correct option is A

Carpenter: A person who works with wood and constructs items such as furniture, doors, and windows.
Window, Wall, Door: These are all physical structures or components of a building.
Conclusion:
The odd one out is: (a) Carpenter, as it refers to a profession, while the others are all parts of a building.