SIXTHLY is a playable word

sixthly Scrabble® Dictionary

adverb
in the sixth place
43 Playable Words can be made from "SIXTHLY"
   2-Letter Words (8 found)
   3-Letter Words (15 found)
   4-Letter Words (12 found)
   5-Letter Words (7 found)
   7-Letter Words (1 found)