What is the difference between pupa, chrysalis and cocoon?

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Pupa (plural: pupae or pupas)

A pupa is the life stage that moths and butterflies as well as other insects go through; it is the stage of transformation between larva and adult in a process known as metamorphoses, and the pupae of different groups of insects have different names.

In the case of butterflies and moths, that name is chrysalis.

Chrysalis (plural: chrysalises)

A chrysalis is a moth’s or butterfly’s pupa life stage. And so, this is the correct name to use when referring to a moth pupa or butterfly pupa. As mentioned previously, different groups of insects have different names. Tumbler for instance is the name for a mosquito pupa.

Cocoon (plural: cocoons)

A cocoon is simply the protective covering around a pupa or chrysalis. It is a protective silk covering spun by the larvae of an insect for protection as pupae. This isn’t to be confused with a shell, which is the protection some butterflies have instead of a cocoon.