Is “Arco” a Scrabble word?
Yes
ARCO
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 Arco
adverb
1.A note in string instrument musical notation indicating that the bow is to be used in the usual way, usually following a passage that is played pizzicato.