YTTRIUMS is a playable word

yttrium Scrabble® Dictionary

noun
pl. yttriums
a metallic element
(adjective) yttric
82 Playable Words can be made from "YTTRIUMS"
   2-Letter Words (10 found)
   3-Letter Words (25 found)
   6-Letter Words (3 found)
   7-Letter Words (1 found)
   8-Letter Words (1 found)