SQUIFFIEST is a playable word

squiffy Scrabble® Dictionary

adjective
squiffier, squiffiest
squiffed
114 Playable Words can be made from "SQUIFFIEST"
   2-Letter Words (13 found)
   3-Letter Words (28 found)
   6-Letter Words (9 found)
   7-Letter Words (2 found)
   10-Letter Words (1 found)