RAREFIER is a playable word

rarefier Scrabble® Dictionary

noun
pl. rarefiers
one that rarefies
65 Playable Words can be made from "RAREFIER"
   2-Letter Words (9 found)
   3-Letter Words (19 found)
   4-Letter Words (14 found)
   6-Letter Words (7 found)
   7-Letter Words (1 found)
   8-Letter Words (1 found)