SHREWDER is a playable word

shrewd Scrabble® Dictionary

adjective
shrewder, shrewdest
having keen insight
(adverb) shrewdly
101 Playable Words can be made from "SHREWDER"
   2-Letter Words (10 found)
   3-Letter Words (21 found)
   6-Letter Words (9 found)
   7-Letter Words (2 found)
   8-Letter Words (1 found)