CESIUMS is a playable word

cesium Scrabble® Dictionary

noun
pl. cesiums
a metallic element
75 Playable Words can be made from "CESIUMS"
   2-Letter Words (9 found)
   3-Letter Words (22 found)
   5-Letter Words (11 found)
   6-Letter Words (5 found)
   7-Letter Words (2 found)