biting louse vs bird louse

biting louse and bird louse both are nouns.

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

As nouns, biting louse and bird louse are synonyms defined as:

biting louse and bird louse: wingless insect with mouth parts adapted for biting; mostly parasitic on birds

Other synonyms of biting louse include louse.

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