Synonyms:
- birring,
- bombilation,
- bombinating,
- bombination,
- booming,
- burring,
- buzzing,
- drone,
- gabble,
- gibber,
- gibbering,
- hum,
- humming,
- jabber,
- jibber,
- low rumbling,
- maundering,
- monotone,
- monotonic,
- mouthing,
- mumble,
- mumbling,
- murmuring,
- mutter,
- muttering,
- purring,
- soniferous,
- sonorous,
- sounded,
- sounding,
- susurration,
- thrumming,
- tonal,
- toneless,
- whirring,
- whisper,
- whispering,
- whizzing