shaft louse vs louse

shaft louse and louse both are nouns.

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

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

shaft louse: a louse parasitic on poultry
louse: wingless insect with mouth parts adapted for biting; mostly parasitic on birds

Other hypernyms of shaft louse include bird louse, biting louse.

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