TIERED is a playable word

tier Scrabble® Dictionary

verb
tiered, tiering, tiers
to arrange in tiers (rows placed one above another)
54 Playable Words can be made from "TIERED"
   2-Letter Words (9 found)
   3-Letter Words (13 found)
   5-Letter Words (6 found)
   6-Letter Words (4 found)