The term NIGHT-FLYING INSECT can be solved by two crossword solutions: MOTH (4 letters) and LUNAMOTH (8 letters). Moths are a type of insect that are closely related to butterflies. They are nocturnal, meaning they are active at night, and they have a wide variety of sizes, shapes, and colors. Lunamoths are a species of MOTH that are found in North America and Europe. They are known for their large size and bright yellow color.