The term 'COOL STUFF' can be broken down into two crossword solutions: MENTHOL (7 letters) and ICE (3 letters). MENTHOL is a chemical compound found in mint plants, which is used to give a cooling sensation when applied to the skin. It is also used as a flavoring agent in many products such as toothpaste, mouthwash, and cigarettes. ICE, on the other hand, is a solid form of water that is commonly used to keep food and drinks cold. It is also used for recreational activities such as ICE skating and ICE hockey. Both MENTHOL and ICE are examples of cool stuff that can be used in everyday life.