Yes, louse is a Scrabble word!
...and is worth 5 points in Scrabble, and 7 points in Words with Friends
louse
Noun
1. Wingless usually flattened bloodsucking insect parasitic on warm-blooded animals
2. A person who has a nasty or unethical character undeserving of respect
3. Any of several small insects especially aphids that feed by sucking the juices from plants
4. Wingless insect with mouth parts adapted for biting; mostly parasitic on birds
What Scrabble words can I make with the letters in louse?
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words