YTTRIUM is a playable word

yttrium Scrabble® Dictionary

noun
pl. yttriums
a metallic element
(adjective) yttric
28 Playable Words can be made from "YTTRIUM"
   2-Letter Words (7 found)
   3-Letter Words (12 found)
   4-Letter Words (7 found)
   5-Letter Words (1 found)
   7-Letter Words (1 found)