What's the difference between the two?
Bzzz, bzzz. What was that buzzing?
Bzzz, bzzz. What was that buzzing noise?
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"Buzz" is the onomatopoetic way to describe that particular kind of noise. "Buzzing noise" is therefore redundant -- but still used, in the way people say things like "ATM machine" or "postpone until later" or "regular routine".