whirr

The fan made a soft whirr as it spun.

The machine started with a loud whirr.

The helicopter's blades began to whirr as it took off.

She could hear the whirr of the coffee grinder in the kitchen.

The drone's propellers whirred as it flew overhead.

The old computer made a familiar whirr as it booted up.

The electric car whirred quietly as it glided down the street.

The wind turbines whirred in the distance, generating electricity for the town.

The sewing machine's needle whirred as it stitched the fabric together.

She could hear the soft whirr of the projector as it displayed the images on the screen.