bird louse vs biting louse

bird louse and biting louse both are nouns.

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

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

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

Other synonyms of bird louse include louse.

bird louse (noun)	biting 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