Is “Idiom” a Scrabble word?
Yes
IDIOM
Valid in at least one Scrabble dictionary
Valid in these dictionaries
SOWPODS / CSW
Scrabble UK & International
TWL / NWL
Scrabble North America
Large English Dictionary
General English word list
Meaning of Idiom
/ˈɪdɪəm/
noun
1.A manner of speaking, a mode of expression peculiar to a language, person, or group of people.
2.A language or language variety; specifically, a restricted dialect used in a given historical period, context etc.
3.An established expression whose meaning is not deducible from the literal meanings of its component words, often peculiar to a given language.
Synonyms: dialect, language, languoid, lect, vernacular, expression