W.C., otherwise known as water closet, is a term that is commonly used to refer to a toilet. However, there are a number of synonyms that can be used to replace this phrase, depending on the context. Some of the most common synonyms for W.C. include lavatory, restroom, bathroom, loo, and washroom. Other terms that can be used to refer to a toilet include commode, privy, latrine, and john. Each of these terms is commonly used in different parts of the world, and many people have their own preferences when it comes to which term they use to refer to this essential fixture.