TASTIEST is a playable word

tasty Scrabble® Dictionary

adjective
tastier, tastiest
pleasant to the taste
(adverb) tastily
98 Playable Words can be made from "TASTIEST"
   2-Letter Words (12 found)
   3-Letter Words (27 found)
   6-Letter Words (8 found)
   7-Letter Words (4 found)
   8-Letter Words (1 found)