DIADEM is a playable word

diadem Scrabble® Dictionary

verb
diademed, diademing, diadems
to adorn with a crown
43 Playable Words can be made from "DIADEM"
   2-Letter Words (12 found)
   3-Letter Words (13 found)
   4-Letter Words (12 found)
   5-Letter Words (4 found)
   6-Letter Words (2 found)