SUNFAST is a playable word

sunfast Scrabble® Dictionary

adjective
resistant to fading by the sun
63 Playable Words can be made from "SUNFAST"
   2-Letter Words (10 found)
   3-Letter Words (22 found)
   5-Letter Words (8 found)
   6-Letter Words (1 found)
   7-Letter Words (1 found)