Difference between Whir and Purr

WHIR vs PURR: NOUN

The buzzing or whirring sound made by a quickly revolving wheel, a partridge's wings, etc.
A buzzing or whizzing sound produced by rapid or whirling motion
Alternative spelling of whirr.
A sound of buzzing or vibration.
Sound of something in rapid motion
A turn; commotion.

To produce a vibrating or buzzing sound or move while making such a sound.
To cause to make or move with such a sound.
To whirl round, or revolve, with a whizzing noise; to fly or more quickly with a buzzing or whizzing sound; to whiz.

To fly, dart, revolve, or otherwise move quickly with a whizzing or buzzing sound; whizz.
To hurry away with a whizzing sound.

Characteristic of cats
Indicate pleasure by purring
To utter a low murmuring sound expressive of satisfaction or pleasure, as a cat.
To express or signify by purring.

Clack, Clunk, Rumble, Screech, Gurgle, Hiss, Whoosh, Thrum, Clatter, Hum, Birr, Whizz, Whiz, Purr, Whirr

Miaow, Yowl, Chirp, Hiss, Throaty, Meow, Growl, Puss, Hum, Make vibrant sounds, Birr, Whizz, Whiz, Whir, Whirr

Clack, Clunk, Rumble, Screech, Gurgle, Hiss, Whoosh, Thrum, Clatter, Hum, Birr, Whizz, Whiz, Purr, Whirr

Roar, Howl, Miaow, Yowl, Chirp, Hiss, Throaty, Growl, Puss, Hum, Birr, Whizz, Whiz, Whir, Whirr

"The gears whir and hum, like a chain being run through a machine," he explains.
With a whir of smooth motors, a Soviet had to finish in third place.
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"Welcome to the 18th century" as the whir of Endeavour's engines fade.
There was a lull in the whir of his sewing machine as he greeted Trey back?
The whir of a microfiche reader still brings back nightmares for many longtime practitioners.
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Cup food Processor is a breeze to Use and will whir prep.
Heard the whir of machinery that meant Grief was transforming.
MEDIA whir and pop through the gates of Balmoral Castle.

KITTY COOTIE CHASER SHOPPIXG Hear pussy purr in luxury!
When stroked, the cats gently vibrate while they purr.
ARSON SAINTS HURTS TO PURR TUESDAY, NOVEMBER IS.
This time, the machine began its gentle purr.
Pick a cute cat and make it purr!
Until today I thought only small cats purr.
Her giant purr was such a comfort, though.
The mechanism by which cats purr is elusive.
Deep-Purr on HalloweenCeredwyn "Silverblue" EalantaChakat Deep-Purr has done hirself up as a witch this Halloween.
Just as cats purr when content, turkeys purr while feeding and feeling secure.