MIFFIEST is a playable word

miffy Scrabble® Dictionary

adjective
miffier, miffiest
easily annoyed
80 Playable Words can be made from "MIFFIEST"
   2-Letter Words (13 found)
   3-Letter Words (22 found)
   6-Letter Words (1 found)
   7-Letter Words (3 found)
   8-Letter Words (1 found)