| babble(verb, utter, whisper, mutter, mumble) |
| burble(verb, whisper, mutter, mumble) |
| buzz(verb, utter, babble, whisper, mutter) |
| continuous sound(verb, expression, utter, babble, whisper) |
| drip(verb, utter, babble, whisper, mutter) |
| drone(verb, utter, babble, whisper, mutter) |
| flow(verb, utter, babble, whisper, mutter) |
| growl(verb, utter, babble, whisper, mutter) |
| gurgle(verb, whisper, mutter, mumble) |
| hum(verb, utter, babble, whisper, mutter) |
| meander(verb, utter, babble, whisper, mutter) |
| moan(verb, utter, babble, whisper, mutter) |
| mumble(verb, utter, babble, whisper, mutter) |
| mutter(verb, utter, babble, whisper, mumble) |
| purl(verb, whisper, mutter, mumble) |
| purr(verb, utter, babble, whisper, mutter) |
| ripple(verb, whisper, mutter, mumble) |
| rumble(verb, utter, babble, whisper, mutter) |
| stage-whisper(verb, utter, babble, whisper, mutter) |
| stammer(verb, utter, babble, whisper, mutter) |