Is the word chef a verb?

No, "chef" is not a verb. It's a noun, meaning a professional cook, especially the head cook in a restaurant.

You could use it in a sentence like this: "The chef prepared a delicious meal."

However, if you wanted to use a verb related to cooking, you could use:

* To cook: "I cooked dinner for my family."

* To prepare: "The chef is preparing a special dish for the guests."

* To chef: This is technically not a verb, but it's a slang term meaning to cook something. "I'm going to chef up a storm tonight!"