Is “Pecs” a Scrabble word?
Yes
PECS
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 Pecs
/pɛks/
noun
1.(usually in the plural) The pectoralis major muscle.
“He's flexing his pecs at anyone who'll look.”