Formic acid is a naturally occurring chemical compound produced by ants. It is an irritant and can be used as a defense mechanism against predators. The term FORMIC ACID PRODUCER refers to the ANT, which is a three-letter word. Ants are social insects that live in colonies and are known for their hard work and organization. They produce formic acid as a defense mechanism against predators, and it is also used to mark trails and communicate with other ants.