SIXTIETHS is a playable word

sixtieth Scrabble® Dictionary

noun
pl. sixtieths
one of sixty equal parts
101 Playable Words can be made from "SIXTIETHS"
   2-Letter Words (13 found)
   3-Letter Words (25 found)
   6-Letter Words (10 found)
   7-Letter Words (2 found)
   8-Letter Words (2 found)
   9-Letter Words (1 found)