TIERING is a playable word

tier Scrabble® Dictionary

verb
tiered, tiering, tiers
to arrange in tiers (rows placed one above another)
69 Playable Words can be made from "TIERING"
   2-Letter Words (10 found)
   3-Letter Words (21 found)
   5-Letter Words (11 found)
   6-Letter Words (5 found)
   7-Letter Words (2 found)