MOURNFULLEST is a playable word

mournful Scrabble® Dictionary

adjective
mournfuller, mournfullest
expressing grief or sorrow
754 Playable Words can be made from "MOURNFULLEST"
   2-Letter Words (29 found)
   3-Letter Words (101 found)
   9-Letter Words (5 found)
   12-Letter Words (1 found)