"louse" in the noun sense
1. louse, sucking louse
wingless usually flattened bloodsucking insect parasitic on warm-blooded animals
2. worm, louse, insect, dirt ball
a person who has a nasty or unethical character undeserving of respect
3. plant louse, louse
any of several small insects especially aphids that feed by sucking the juices from plants
4. bird louse, biting louse, louse
wingless insect with mouth parts adapted for biting mostly parasitic on birds
Source: WordNet® (An amazing lexical database of English)
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