KOOKIEST is a playable word

kooky Scrabble® Dictionary

adjective
kookier, kookiest
eccentric
(adverb) kookily
69 Playable Words can be made from "KOOKIEST"
   2-Letter Words (14 found)
   3-Letter Words (22 found)
   5-Letter Words (9 found)
   6-Letter Words (2 found)
   8-Letter Words (1 found)