Birr is a word used to describe a sharp, high-pitched sound produced by a variety of sources. Synonyms for birrs include buzz, whir, hum, murmur, drone, and vibrato. The sound of birrs can be heard in electronic devices, such as fans, motors, and machines, as well as in nature, such as birds and insects. Birrs can also be produced by musical instruments like the violin, guitar, and percussion instruments. These words can be used interchangeably with birrs in sentences. For example, "The bees produced a constant buzz," can be exchanged with "The bees produced a constant birr".