P3R1O1B3O1S1C3I1D2I1A1N1S1
20 points
PROBOSCIDIANS is validvalid
PROBOSCIDIAN,
PROBOSCIDIAN, any of an order of large mammals comprising the elephants and extinct related forms, also PROBOSCIDEAN
PROBOSCIDIAN,
PROBOSCIDIAN, any of an order of large mammals comprising the elephants and extinct related forms, also PROBOSCIDEAN