DIDYMIUM is a playable word

didymium Scrabble® Dictionary

noun
pl. didymiums
a mixture of rare-earth elements
25 Playable Words can be made from "DIDYMIUM"
   2-Letter Words (6 found)
   3-Letter Words (11 found)
   4-Letter Words (4 found)
   5-Letter Words (3 found)
   8-Letter Words (1 found)