The chaconne made an astonishing metamorphosis into a butterfly will the word metamorphosis be a verb

No, it wouldn't be. Metamorphosis would be a noun, because it's not an action, made would be the verb in this sentence.

Metamorphosis isn't the action of transforming, it is the idea of the process of transformation, so therefore it wouldn't be a verb.

Yes because it’s doing the change

Ex. The skyline metamorphosis into a sea sky