O1V4E1R1L1A1B3O1U1R1I1N1G2
19 points
OVERLABOURING is validvalid
OVERLABOUR, to labour excessively
OVERLABOUR, (archaic) to labour excessively, also OVERLABOR
OVERLABOUR, to labour excessively
OVERLABOUR, (archaic) to labour excessively, also OVERLABOR