THIRDLY is a playable word

thirdly Scrabble® Dictionary

adverb
in the third place
30 Playable Words can be made from "THIRDLY"
   2-Letter Words (5 found)
   3-Letter Words (10 found)
   4-Letter Words (9 found)
   5-Letter Words (5 found)
   7-Letter Words (1 found)