Bullroarer
ahd-5
noun.
A small wooden slat attached to a string that makes a roaring noise when whirled.
Wiktionary, Creative Commons Attribution/Share-Alike License
noun.
An ancient
ritual
musical instrument
and means of
communicating
over extended distances, dating back to the
Paleolithic
period.
Word Usage
"The bullroarer is a long flat board with notches, or slits, at one end, and a rope at the other."
suggests
bulldozer