louse vs insect

louse and insect both are nouns.

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

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

louse: wingless usually flattened bloodsucking insect parasitic on warm-blooded animals
insect: small air-breathing arthropod

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

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

As nouns, louse and insect are synonyms defined as:

louse and insect: a person who has a nasty or unethical character undeserving of respect

Other synonyms of louse include dirt ball, worm.

louse (noun)	insect (noun)
wingless usually flattened bloodsucking insect parasitic on warm-blooded animals	small air-breathing arthropod
any of several small insects especially aphids that feed by sucking the juices from plants	a person who has a nasty or unethical character undeserving of respect
wingless insect with mouth parts adapted for biting; mostly parasitic on birds
a person who has a nasty or unethical character undeserving of respect