RATTER is a playable word

ratter Scrabble® Dictionary

noun
pl. ratters
an animal used for catching rats
41 Playable Words can be made from "RATTER"
   2-Letter Words (8 found)
   3-Letter Words (16 found)
   4-Letter Words (9 found)
   5-Letter Words (6 found)
   6-Letter Words (2 found)