NIFTIEST is a playable word

nifty Scrabble® Dictionary

adjective
niftier, niftiest
stylish; pleasing
(adverb) niftily
noun
pl. nifties
something that is nifty
105 Playable Words can be made from "NIFTIEST"
   2-Letter Words (13 found)
   3-Letter Words (27 found)
   6-Letter Words (6 found)
   7-Letter Words (3 found)
   8-Letter Words (1 found)