A carpenter is someone who works with wood. Carpenters might build houses, or furniture, or carve beautiful things out of wood. The tools you are most likely to see a carpenter using are a hammer and saw.
Clowns are performers in fancy dress, and are usually found in circuses and doing street performances. They usually wear a very brightly coloured outfit, a silly hat, big shoes, a coloured wig and face paint. They usually do very silly things to make people laugh.
A cook is someone who prepares and cooks food for a living. A cook in a higher class restaurant is usually called a chef.
Cooking is also the process of preparing food to eat by using heat, for example you need to cook potatoes before you can eat them.