Explanation:

- Pencil : Sharpener

- A sharpener is used to make a pencil sharp. It enhances the utility of a pencil by ensuring it has a fine point.

- Wood : ?

- We need a tool that is used to shape or fashion wood to enhance or change its utility.

- Option 1: Rubber

- Rubber is a different material and not a tool for shaping wood.

- Option 2: Tree

- A tree is the source of wood, not a tool for altering it.

- Option 3: Axe

- An axe is a tool used for chopping wood, similar to how a sharpener is used for sharpening a pencil.

- Option 4: Screwdriver

- A screwdriver is used for driving screws, not related to shaping wood.