Yes, idiom is a Scrabble word!
...and is worth 8 points in Scrabble, and 9 points in Words with Friends
idiom
Noun
1. A manner of speaking that is natural to native speakers of a language
2. The usage or vocabulary that is characteristic of a specific group of people
3. The style of a particular artist or school or movement
4. An expression whose meanings cannot be inferred from the meanings of the words that make it up
What Scrabble words can I make with the letters in idiom?
5 Letter Words
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2 Letter Words