The term 'Future Butterfly' is composed of two words, 'PUPA' and 'CATERPILLAR'. PUPA is a four-letter word which refers to the stage in the life cycle of a butterfly when it is in its chrysalis or cocoon. During this stage, the butterfly undergoes a process of metamorphosis, where it changes from a CATERPILLAR into an adult butterfly. CATERPILLAR is an eleven-letter word which refers to the larval stage of a butterfly, during which it feeds on plants and grows rapidly.