Is “Coupler” a Scrabble word?
Yes
COUPLER
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 Coupler
/ˈkʌplə/
noun
1.Someone who couples things together, especially someone whose job it is to couple railway carriages.
2.Anything that serves to couple things together; but especially a device that couples railway carriages.
3.A device that connects two keyboards of an organ together so that they play together.