SLICK is validvalid

smooth and slippery [adj SLICKER, SLICKEST] : SLICKLY [adv], SLICKNESS [n] / to make slick [v SLICKED, SLICKING, SLICKS]

12,906 of 196,601 in NWL2023·also valid in CSW24

smooth and slippery [adj SLICKER, SLICKEST, SLICKLY] / to make slick [v -ED, -ING, -S]