Yes, kazoo is a Scrabble word!
...and is worth 18 points in Scrabble, and 18 points in Words with Friends
kazoo
Noun
1. A toy wind instrument that has a membrane that makes a sound when you hum into the mouthpiece
What Scrabble words can I make with the letters in kazoo?
3 Letter Words
2 Letter Words
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Words that can be created with an extra letter added to kazoo:
S:kazoos