There are several synonyms for the word "lip". Some of the most commonly used are mouth, pout, kisser, smacker, and chops. The term "moue" is used to describe a facial expression made by pouting lips. The lower lip may be referred to as the "bottom lip", while the upper lip may be called the "top lip". The term "smack" is often used to describe a loud kiss made with the lips. "Chops" is a slang term for the lips used by jazz musicians and is derived from the verb "chop" meaning to play one's instrument with skill and precision.