The term 'Rat or Rooster' is an ANIMAL with 6 letters. It refers to two different animals, the rat and the rooster. The rat is a small rodent that is found in many parts of the world. It is usually considered a pest due to its ability to spread disease and contaminate food. The rooster is a large bird that is commonly kept as a farm ANIMAL. It is known for its loud crowing sound and is often used as a symbol of courage and strength.