lepidopterous insect vs insect

lepidopterous insect and insect both are nouns.

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

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

lepidopterous insect: insect that in the adult state has four wings more or less covered with tiny scales
insect: small air-breathing arthropod

lepidopterous insect (noun)	insect (noun)
insect that in the adult state has four wings more or less covered with tiny scales	small air-breathing arthropod
	a person who has a nasty or unethical character undeserving of respect