Is “Ordinals” a Scrabble word?
Yes
ORDINALS
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 Ordinals
noun
1.An ordinal number such as first, second and third.
“The most common numerals in Latin, as in English, are the "cardinals"...and the "ordinals"... — F. M. Wheelock, Wheelock’s Latin, 6th ed. revised (2005), p97”
2.A book used in the ordination of Anglican ministers, or in certain Roman Catholic services