Is “Colloquialism” a Scrabble word?
Yes
COLLOQUIALISM
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 Colloquialism
/kəˈləʊkwi.əˌlɪzəm/
noun
1.A colloquial word or phrase; a common spoken expression.
2.Colloquial style of speaking.