ROISTER is validvalid

to revel [v ROISTERED, ROISTERING, ROISTERS] : ROISTERER [n], ROISTERING [n]

50,416 of 196,601 in NWL2023·also valid in CSW24

to revel noisily, carouse, also ROIST, ROYST, ROYSTER [v -ED, -ING, -S]