Synonyms:
- beating,
- birring,
- bombilation,
- bombinating,
- bombination,
- booming,
- burring,
- buzzing,
- clicking,
- droning,
- drumming,
- fluttering,
- hum,
- humming,
- low rumbling,
- palpitant,
- pounding,
- purring,
- spattering,
- spluttering,
- sputtering,
- staccato,
- throbbing,
- thumping,
- ticking,
- whirring,
- whizzing