Greases is a term used to refer to a variety of substances that are used to lubricate and protect surfaces. Lards, which has five letters, is a type of fat that is used as a cooking ingredient and for lubrication. Oils, with four letters, are also used as lubricants and are derived from plants, animals, or petroleum. UDDERS, with six letters, refers to the mammary glands of cows, which produce milk and are sometimes used to make lubricants.