Yes, tedium is a Scrabble word!
...and is worth 9 points in Scrabble, and 11 points in Words with Friends
tedium
Noun
1. The feeling of being bored by something tedious
2. Dullness owing to length or slowness
What Scrabble words can I make with the letters in tedium?
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words