louse vs biting louse

louse and biting louse both are nouns.

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

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

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

Other synonyms of louse include bird louse.

louse (noun)	biting louse (noun)
wingless usually flattened bloodsucking insect parasitic on warm-blooded animals	wingless insect with mouth parts adapted for biting; mostly parasitic on birds
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