Mugs are a type of drinking vessel that come in a variety of shapes and sizes. The term 'mugs' can refer to four different types of vessels: faces (5 letters), KISSERS (7 letters), steins (6 letters), and cups (4 letters). Faces are typically shallow, wide-mouthed mugs with handles, while KISSERS are tall, narrow-mouthed mugs with handles. Steins are large, heavy mugs with lids, and cups are small, lightweight mugs without handles. All four types of mugs are commonly used for drinking beverages such as coffee, tea, and beer.