mumble (n.)
- aspirate
- aspiration
- bark
- bellow
- bite
- blare
- blubber
- boom
- bray
- breath
- buzz
- cackle
- champ
- chant
- chaw
- chew
- chirp
- chomp
- coo
- crow
- drawl
- drone
- droning
- exhalation
- flute
- fumble
- gabble
- gasp
- gibber
- grind
- growl
- grunt
- gum
- hammer
- hiss
- jabber
- keen
- lilt
- limp
- mouth
- muddle
- mumbling
- munch
- murmur
- murmuration
- murmuring
- mutter
- muttering
- nibble
- pant
- pipe
- roar
- rumble
- rumor
- scream
- screech
- shriek
- shuffle
- sigh
- sing
- snap
- snarl
- snort
- sob
- speak
- splutter
- sputter
- squall
- squawk
- squeal
- stammer
- stumble
- stutter
- susurration
- susurrus
- swallow
- talk
- thunder
- trumpet
- twang
- undertone
- utter
- voice
- wail
- warble
- whine
- whisper
- whispering
- yap
- yell
- yelp
mumble (v.)
- aspirate
- bark
- bawl
- bellow
- bite
- blare
- blat
- blubber
- boom
- bray
- breath
- breathe
- buzz
- cackle
- champ
- chant
- chaw
- chew
- chirp
- chomp
- coo
- crow
- drawl
- drone
- exclaim
- flute
- fumble
- gabble
- gasp
- gibber
- gnash
- gnaw
- grind
- growl
- grunt
- gum
- hammer
- hiss
- jabber
- keen
- lilt
- limp
- masticate
- maunder
- mouth
- muddle
- munch
- murmur
- mussitate
- mutter
- nibble
- pant
- pipe
- roar
- rumble
- ruminate
- rumor
- scream
- screech
- shriek
- shuffle
- sibilate
- sigh
- sing
- snap
- snarl
- snort
- sob
- speak
- splutter
- sputter
- squall
- squawk
- squeal
- stammer
- stumble
- stutter
- susurrate
- swallow
- talk
- thunder
- trumpet
- twang
- utter
- verbalize
- vocalize
- voice
- wail
- warble
- whine
- whisper
- yap
- yawp
- yell
- yelp
