• unside,
• burnde,
• buside,
• burnisde,
• burnsed,
• vurnside,
• nurnside,
• hurnside,
• gurnside,
• byrnside,
• bhrnside,
• bjrnside,
• birnside,
• burside,
• burnsside,
• bernside,
• Barmeside,
• burnonite,
• murenoide,
• bunoide

• burnished,
• burns,
• burnous,
• Burnias,
• Burnsed,
• burnish,
• burnes.

The plural form of the word "burnside" is "burnsides"

The singular form of the word "burnside" is "burnside". The word does not change between singular and plural forms.