Is “Fifteenth” a Scrabble word?
Yes
FIFTEENTH
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 Fifteenth
/ˌfɪfˈtiːnθ/
noun
1.The person or thing in the fifteenth position.
2.One of fifteen equal parts of a whole.
3.The interval comprising two octaves.
adjective
1.The ordinal form of the number fifteen.