FOULER is a playable word

foul Scrabble® Dictionary

adjective
fouler, foulest
offensive to the senses
verb
fouled, fouling, fouls
to make foul
45 Playable Words can be made from "FOULER"
   2-Letter Words (9 found)
   3-Letter Words (16 found)
   4-Letter Words (17 found)
   5-Letter Words (2 found)
   6-Letter Words (1 found)