• buring,
• berring,
• beering,
• burring,
• virring,
• nirring,
• girring,
• bjrring,
• bkrring,
• b9rring,
• b8rring,
• biering,
• bifring,
• bi5ring,
• bi4ring,
• bir5ing,
• bir4ing,
• birrring,
• birringg,
• Berrring

• baring,
• bearing,
• barring,
• bring,
• boring.

The adjective form of the word "birring" is "birring". However, "birring" is more commonly used as a verb to describe the sound made by insects or machinery.