COOLER is a playable word

cooler Scrabble® Dictionary

noun
pl. coolers
something that cools
32 Playable Words can be made from "COOLER"
   2-Letter Words (6 found)
   3-Letter Words (13 found)
   4-Letter Words (9 found)
   5-Letter Words (3 found)
   6-Letter Words (1 found)