SPIKIEST is a playable word

spiky Scrabble® Dictionary

adjective
spikier, spikiest
resembling a spike
(adverb) spikily
107 Playable Words can be made from "SPIKIEST"
   2-Letter Words (10 found)
   3-Letter Words (25 found)
   6-Letter Words (6 found)
   8-Letter Words (1 found)