Menopon gallinae vs bird louse

Menopon gallinae and bird louse both are nouns.

Word	Noun	Adjective	Verb	Adverb
Menopon gallinae	Yes	No	No	No
bird louse	Yes	No	No	No

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

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

Other hypernyms of Menopon gallinae include biting louse, louse.

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