ROOTER is a playable word

rooter Scrabble® Dictionary

noun
pl. rooters
one that gives encouragement or support
28 Playable Words can be made from "ROOTER"
   2-Letter Words (7 found)
   3-Letter Words (11 found)
   4-Letter Words (6 found)
   5-Letter Words (2 found)
   6-Letter Words (2 found)