Yes, idiom is in the scrabble dictionary

...and is worth 9 points by itself.

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Idiom Definition

noun

A specialized vocabulary used by a group of people; jargon: legal idiom.
from The American Heritage Dictionary of the English Language, 4th Edition
A speech form or an expression of a given language that is peculiar to itself grammatically or cannot be understood from the individual meanings of its elements, as in keep tabs on.
from The American Heritage Dictionary of the English Language, 4th Edition
A style of artistic expression characteristic of a particular individual, school, period, or medium: the idiom of the French impressionists; the punk rock idiom.
from The American Heritage Dictionary of the English Language, 4th Edition
Regional speech or dialect.
from The American Heritage Dictionary of the English Language, 4th Edition
The specific grammatical, syntactic, and structural character of a given language.
from The American Heritage Dictionary of the English Language, 4th Edition

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Top Words by points

Points

imido

8

2 letter words with IDIOM

Points

mo

4

om

4

oi

2

od

3

do

3

mi

4

id

3

3 letter words with IDIOM

Points

mid

6

mod

6

moi

5

dom

6

dim

6

4 letter words with IDIOM

Points

imid

7

midi

7

modi

7

5 letter words with IDIOM

Points

imido

8

idiom

8

Found 17 words in 0.14434 seconds