SIXTIETH is a playable word

sixtieth Scrabble® Dictionary

noun
pl. sixtieths
one of sixty equal parts
68 Playable Words can be made from "SIXTIETH"
   2-Letter Words (13 found)
   3-Letter Words (23 found)
   5-Letter Words (9 found)
   6-Letter Words (2 found)
   8-Letter Words (1 found)