Whur /(?)/

Whur

v. i.
  1. To make a rough, humming sound, like one who pronounces the letter r with too much force; to whir; to birr.
  2. To snarl or growl, as a dog.

Whur

n.
  1. A humming or whirring sound, like that of a body moving through the air with velocity; a whir.