BOSSEST is a playable word

boss Scrabble® Dictionary

verb
bossed, bossing, bosses
to supervise
adjective
bosser, bossest
first-rate, excellent
46 Playable Words can be made from "BOSSEST"
   2-Letter Words (9 found)
   3-Letter Words (15 found)
   4-Letter Words (13 found)
   5-Letter Words (4 found)
   6-Letter Words (4 found)
   7-Letter Words (1 found)