Is “Syn” a Scrabble word?
Yes
SYN
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 Syn
adjective
1.That has a torsion angle between 0° and 90°.