Is “Flex” a Scrabble word?
Yes
FLEX
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 Flex
/flɛks/
noun
1.Flexibility, pliancy.
2.The or an act of flexing.
3.Any flexible insulated electrical wiring.
verb
1.To bend something.
2.To repeatedly bend one of one's joints.
3.To move part of the body using one's muscles.