CHILL is validvalid

cool [adj CHILLER, CHILLEST] : CHILLNESS [n], CHILLY [adj] / to make cold [v CHILLED, CHILLING, CHILLS] : CHILLER [n], CHILLINGLY [adv]

6,855 of 196,601 in NWL2023·also valid in CSW24

to make cold [v -ED, -ING, -S] / cool [adj CHILLER, CHILLEST]