Whur

Part of speech: noun (n.)

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

Part of speech: verb (v.)

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. Halliwell.