Signs 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 bacteria. They can also be caused by chemical reactions, such as those that occur when paint or other materials break down. ODORS can be a sign that something is not right and should be addressed.