FILLS is a playable word

fill Scrabble® Dictionary

verb
filled, filling, fills
to put as much as can be held into
(adjective) fillable
13 Playable Words can be made from "FILLS"
   2-Letter Words (4 found)
   3-Letter Words (4 found)
   4-Letter Words (4 found)
   5-Letter Words (1 found)