A cockroach, for one, is an insect belonging to the order Blattodea. It is one of the most common household pests and is known for its ability to survive in a wide range of environments. The term 'cockroach' is derived from the Spanish word cucaracha, which means 'little beetle.' Cockroaches are typically brown or black in color and can range in size from 1/4 inch to 2 inches long. They have six legs and two antennae, and they are capable of flying short distances.