RUDER is a playable word

rude Scrabble® Dictionary

adjective
ruder, rudest
discourteous or impolite
(adverb) rudely
15 Playable Words can be made from "RUDER"
   2-Letter Words (4 found)
   3-Letter Words (5 found)
   4-Letter Words (5 found)
   5-Letter Words (1 found)