Is “Bucko” a Scrabble word?
Yes
BUCKO
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 Bucko
/ˈbʌkoʊ/
noun
1.Buckaroo.
2.Young lad, friend, pal (used in addressing someone).