biting louse vs insect

biting louse and insect both are nouns.

Word	Noun	Adjective	Verb	Adverb
biting louse	Yes	No	No	No
insect	Yes	No	No	No

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

biting louse: wingless insect with mouth parts adapted for biting; mostly parasitic on birds
insect: small air-breathing arthropod

biting louse (noun)	insect (noun)
wingless insect with mouth parts adapted for biting; mostly parasitic on birds	small air-breathing arthropod
	a person who has a nasty or unethical character undeserving of respect