FIFTHLY is a playable word

fifthly Scrabble® Dictionary

adverb
in the fifth place
24 Playable Words can be made from "FIFTHLY"
   2-Letter Words (5 found)
   3-Letter Words (8 found)
   4-Letter Words (5 found)
   5-Letter Words (4 found)
   6-Letter Words (1 found)
   7-Letter Words (1 found)