Pupas are the developmental stage of insects, where they transform from a larva to an adult. There are many synonyms for the word pupas, including cocoon, chrysalis, and nymph. The term cocoon is typically used to describe the pupas of moths and some butterflies, while the term chrysalis is used to describe the pupas of most butterflies. Nymph is a term used to describe the pupas of insects such as grasshoppers, dragonflies, and cockroaches. Regardless of the term used, the transformation that occurs during the pupa stage is a crucial part of the insect life cycle and can have a significant impact on the ecosystem as a whole.