whirrer
nounUK /ˈwɜːrə/
US /ˈwɜːrər/
A whirrer is something that makes a soft, spinning sound.
The little fan was a quiet whirrer on the desk.
OTHER MEANINGS
2. A person or thing that moves very fast.
The old clock was a steady whirrer all night.
3. A device that spins around quickly.
The toy top is a colorful whirrer.
4. A sound like a bird's wings flapping fast.
We heard the whirrer of wings above us.