The crossword solutions for the term CATERPILLAR OR BUTTERFLY are 'LARVA' (5 letters). The LARVA STAGE is a developmental period in the life cycle of insects such as caterpillars and butterflies. During this STAGE, the insect undergoes a process of metamorphosis, where it changes from an immature form to an adult form. Caterpillars and butterflies both spend their larval STAGE eating and growing until they reach a certain size, at which point they enter the pupal STAGE and eventually emerge as adults.