grumble (n.)
- beef
- belch
- bellyache
- bitch
- blare
- boom
- brawl
- bray
- burr
- buzz
- cackle
- cannonade
- caw
- clamor
- clang
- clangor
- clank
- clash
- crab
- croak
- crunch
- echo
- fret
- fuss
- gnarl
- grind
- gripe
- groan
- grouch
- grouse
- growl
- growling
- grumbling
- grunt
- hiss
- holler
- howl
- jangle
- jar
- kick
- moan
- murmur
- mutter
- peal
- rasp
- rebound
- reverberation
- roar
- roll
- rumble
- rumbling
- scold
- scrape
- scratch
- scrunch
- snap
- snarl
- snore
- spit
- squawk
- thunder
- twang
- whine
- yap
- yelp
grumble (v.)
- beef
- belch
- bellyache
- bitch
- blare
- blat
- boom
- brawl
- bray
- burr
- buzz
- cackle
- cannonade
- caw
- chirr
- clamor
- clang
- clangor
- clank
- clash
- complain
- crab
- craunch
- croak
- crump
- crunch
- echo
- fret
- fuss
- gnarl
- grind
- gripe
- groan
- grouch
- grouse
- growl
- grunt
- hiss
- holler
- howl
- jangle
- jar
- kick
- moan
- murmur
- mutter
- peal
- rasp
- rebound
- reecho
- resound
- roar
- roll
- rumble
- scold
- scranch
- scrape
- scratch
- scrunch
- snap
- snarl
- snore
- spit
- squawk
- thunder
- twang
- whine
- yap
- yelp
