The term CARPENTER OR 'HARVESTER' INSECT is a 3-letter word for ANT. Ants are social insects that live in colonies and are found all over the world. They are known for their hard work and organization, often working together to build nests, gather food, and protect their colonies. The harvester ANT is a species of ANT that collects and stores seeds as a food source. Carpenter ants are a species of ANT that build nests in wood, often causing damage to buildings and other structures.