| Main Entry: | drone |
| Part of Speech: | noun |
| Definition: | continuous noise |
| Synonyms: | buzz, hum, murmur, purr, sound, vibration, whirr |
| Antonyms: | quiet, silence |
| Main Entry: | drone |
| Part of Speech: | verb |
| Definition: | making noise continuously |
| Synonyms: | bombinate, buzz, chant, drawl, hum, intone, nasalize, purr, sound, strum, thrum, vibrate, whirr |
| Antonyms: | be quiet, silence |
| Main Entry: | hum |
| Part of Speech: | verb |
| Definition: | buzz, vibrate |
| Synonyms: | bombilate, bombinate, bum, bumble, croon, drone, moan, mumble, murmur, purr, rustle, sing, sing low, sound, strum, throb, thrum, trill, warble, whir, whisper, zoom |
| Main Entry: | murmur |
| Part of Speech: | noun |
| Definition: | low, continuous sound |
| Synonyms: | babble, buzz, buzzing, drone, grumble, hum, humming, mumble, murmuration, mutter, muttering, purr, rumble, rumor, susurration, undertone, whisper, whispering |
| Main Entry: | murmur |
| Part of Speech: | verb |
| Definition: | make low, continuous sound |
| Synonyms: | babble, burble, buzz, drip, drone, flow, growl, gurgle, hum, meander, moan, mumble, mutter, purl, purr, ripple, rumble, stage-whisper, stammer, stutter, susurrate, tinkle, trickle, utter, verbalize, vocalize, voice, whisper |
| Antonyms: | speak clearly |
| Main Entry: | sing |
| Part of Speech: | verb |
| Definition: | carry a tune with one's voice |
| Synonyms: | belt out, burst into song, buzz*, canary, cantillate, carol, chant, chirp, choir, croon, descant, duet, groan*, harmonize, hum, hymn, intone, lift up a voice, line out, lullaby, make melody, mouth, pipe, purr, resound, roar, serenade, shout, singsong, solo, trill, troll, tune, vocalize, wait, warble, whine, whistle, yodel |
| Antonyms: | be quiet |
| Main Entry: | sough |
| Part of Speech: | noun |
| Definition: | murmur |
| Synonyms: | babble, buzz*, buzzing, drone, grumble, hum, humming, mumble, murmuration, mutter, muttering, purr, rumble*, rumor, sigh, susurration, susurrus, undertone, whisper, whispering |
| Main Entry: | sough |
| Part of Speech: | verb |
| Definition: | murmur |
| Synonyms: | babble, burble, buzz*, drip, drone, flow, growl, gurgle, hum, meander, moan, mumble, mutter, purl, purr, ripple, rumble*, sigh, stage-whisper, stammer, stutter, susurrate, tinkle, trickle, utter, verbalize, vocalize, voice, whisper |