FIERIER is a playable word

fiery Scrabble® Dictionary

adjective
fierier, fieriest
intensely hot
(adverb) fierily
33 Playable Words can be made from "FIERIER"
   2-Letter Words (5 found)
   3-Letter Words (11 found)
   4-Letter Words (6 found)
   5-Letter Words (7 found)
   6-Letter Words (2 found)
   7-Letter Words (2 found)