shaft louse vs biting louse

shaft louse and biting louse both are nouns.

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

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

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

Other hypernyms of shaft louse include bird louse, louse.

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