pupa vs insect

pupa and insect both are nouns.

Word	Noun	Adjective	Verb	Adverb
pupa	Yes	No	No	No
insect	Yes	No	No	No

As nouns, insect is a hypernym of pupa; that is, insect is a word with a broader meaning than pupa:

pupa: an insect in the inactive stage of development (when it is not feeding) intermediate between larva and adult
insect: small air-breathing arthropod

pupa (noun)	insect (noun)
an insect in the inactive stage of development (when it is not feeding) intermediate between larva and adult	small air-breathing arthropod
	a person who has a nasty or unethical character undeserving of respect