SUBTEST is a playable word

subtest Scrabble® Dictionary

noun
pl. subtests
a subdivision of a test
60 Playable Words can be made from "SUBTEST"
   2-Letter Words (6 found)
   3-Letter Words (17 found)
   5-Letter Words (12 found)
   6-Letter Words (2 found)
   7-Letter Words (1 found)