Indications of decay can include ODORS, which are five letter words that can be used to describe a smell that is unpleasant or indicative of something decaying. ODORS can be caused by a variety of things, such as rotting food, mold, and other substances that have begun to break down. They can also be caused by bacteria and other microorganisms that are present in the environment. ODORS can be a sign that something is not right and should be addressed.