Is pupa the same as nymph?

No, a pupa and a nymph are not the same. A pupa is a developmental stage in the life cycle of insects like butterflies and moths, where the organism undergoes transformation within a protective casing. In contrast, a nymph is an immature form of certain insects, such as grasshoppers and dragonflies, that resembles a small adult and typically undergoes several molts before reaching maturity.