TRIALIST is a playable word

trialist Scrabble® Dictionary

noun
pl. trialists
a person who participates in a test of something
128 Playable Words can be made from "TRIALIST"
   2-Letter Words (12 found)
   3-Letter Words (31 found)
   6-Letter Words (6 found)
   7-Letter Words (2 found)
   8-Letter Words (1 found)