GRUMPING is a playable word

grump Scrabble® Dictionary

verb
grumped, grumping, grumps
to complain
73 Playable Words can be made from "GRUMPING"
   2-Letter Words (9 found)
   3-Letter Words (31 found)
   5-Letter Words (5 found)
   6-Letter Words (5 found)
   7-Letter Words (1 found)
   8-Letter Words (1 found)