RETARD is a playable word

retard Scrabble® Dictionary

verb
retarded, retarding, retards
to slow the progress of
57 Playable Words can be made from "RETARD"
   2-Letter Words (12 found)
   3-Letter Words (17 found)
   4-Letter Words (12 found)
   5-Letter Words (12 found)
   6-Letter Words (4 found)