buzz saw

noun2

1. •
   A powerful, noisy, motorized saw, typically having a rotary blade with large teeth, sometimes portable and sometimes mounted into a table.

   • The American mind exasperated the European as a buzz-saw might exasperate a pine forest. — 1905
2. •
   A type of noisemaker in the form of a spinning disc spun on an untwisting string like a whirligig.