TARTEST is a playable word

tart Scrabble® Dictionary

adjective
tarter, tartest
having a sharp, sour taste
verb
tarted, tarting, tarts
to dress up
101 Playable Words can be made from "TARTEST"
   2-Letter Words (10 found)
   3-Letter Words (28 found)
   6-Letter Words (7 found)
   7-Letter Words (3 found)