RILLING is a playable word

rill Scrabble® Dictionary

verb
rilled, rilling, rills
to flow like a rill (a small brook)
22 Playable Words can be made from "RILLING"
   2-Letter Words (3 found)
   3-Letter Words (6 found)
   4-Letter Words (9 found)
   5-Letter Words (2 found)
   6-Letter Words (1 found)
   7-Letter Words (1 found)