A person who works with wood and uses a machine to make it smooth.
Being a sanders is a skilled job that makes wood nice and even.
Examples:
The sander makes the wood smooth.
The sander works with wood.
I want to be a sander when I grow up.
The sander is good at making things smooth.
The sander can make the wood very, very smooth.
The sander is like a magic person for wood.