| gurgle(flow, babble, whisper, ripple, mutter) |
| harmonize(verb, wait, shout, whistle, chant) |
| hiss(call, cry, ring, whimper, mew) |
| hymn(verb, wait, shout, whistle, chant) |
| intone(verb, sound, wait, shout, whistle) |
| joy |
| laugh |
| lift up a voice(expression, idiom, wait, shout, whistle) |
| line out(verb, expression, wait, shout, whistle) |
| lullaby(verb, wait, shout, whistle, chant) |
| make melody(verb, expression, wait, shout, whistle) |
| meander(utter, flow, babble, whisper, ripple) |
| moan(utter, flow, babble, whine, whisper) |
| mouth(verb, wait, shout, whistle, chant) |
| mumble(low, utter, flow, buzz, babble) |
| murmuration(low, buzz) |
| mutter(low, utter, flow, buzz, babble) |
| pipe(noun, verb, cry, wait, shout) |
| purl(flow, babble, whisper, ripple, mutter) |
| purring |