JOYFULLER is a playable word

joyful Scrabble® Dictionary

adjective
joyfuller, joyfullest
happy
(adverb) joyfully
100 Playable Words can be made from "JOYFULLER"
   2-Letter Words (13 found)
   3-Letter Words (29 found)
   6-Letter Words (6 found)
   7-Letter Words (1 found)
   9-Letter Words (1 found)