Insects have a complex life cycle that includes several stages. The term INSECT STAGE can refer to five different stages: PUPA (4 letters), LARVA (5 letters), Imago (5 letters), Instar (6 letters), and ADULT (5 letters). PUPA is the stage between LARVA and ADULT, during which the insect undergoes metamorphosis. LARVA is the immature form of an insect, usually worm-like in appearance. Imago is the ADULT form of an insect, which has fully developed wings and reproductive organs. Instar is an intermediate stage between LARVA and ADULT, during which the insect undergoes molting. ADULT is the fully mature form of an insect, which is capable of reproduction. IMAG is an abbreviation for imago, the ADULT form of an insect.