Is “Sim” a Scrabble word?
Yes
SIM
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 Sim
/sɪm/
noun
1.A simulation or simulator.
“They played a flight sim all afternoon.”