The term 'COLONY DENIZEN' can be solved by the three letter word 'ANT'. Ants are a type of social insect that live in colonies and are known for their hard work and cooperation. They are found on every continent except Antarctica and are one of the most successful species on the planet. Ants have been around for millions of years and are an important part of many ecosystems. They are also a popular subject of study for scientists due to their complex behavior and social structure.