Is “Sixteenth” a Scrabble word?
Yes
SIXTEENTH
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 Sixteenth
/ˌsɪksˈtiːnθ/
noun
1.One of sixteen equal parts of a whole.
“A sixteenth of 320 is 20.”
adjective
1.The ordinal form of the number sixteen.