Tiny insects are a diverse group of invertebrates that can range from the MIDGE, which has five letters, to the GNAT, which has four letters, to the ANT, which has three letters, to the FLEA, which has four letters, to the NIT, which has three letters, and finally to the MITE, which has four letters. These insects are usually very small and can be found in a variety of habitats, from forests to deserts. They play an important role in the environment by providing food for other animals, helping to break down organic matter, and aiding in pollination.