common louse vs sucking louse

common louse and sucking louse both are nouns.

Word	Noun	Adjective	Verb	Adverb
common louse	Yes	No	No	No
sucking louse	Yes	No	No	No

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

common louse: head or body louse
sucking louse: wingless usually flattened bloodsucking insect parasitic on warm-blooded animals

Other hypernyms of common louse include louse.

common louse (noun)	sucking louse (noun)
head or body louse	wingless usually flattened bloodsucking insect parasitic on warm-blooded animals