The term ROACH OR RAT can be summarized as a PEST, which is a four letter word. Pests are organisms that cause damage to crops, livestock, and other resources. They can also spread diseases and contaminate food. Common pests include rodents, insects, and birds. Roaches and rats are two of the most common pests, and they can cause significant damage to homes and businesses. Roaches and rats can also spread diseases and contaminate food, making them a serious health hazard.