• aerenoa,
• zerenoa,
• xerenoa,
• derenoa,
• eerenoa,
• werenoa,
• swrenoa,
• ssrenoa,
• seeenoa,
• se5enoa,
• serrenoa,
• serenioa,
• serenoia,
• sarenoa,
• seranoa,
• serenaa,
• serenea,
• Serinaoa,
• Sarrenoa,
• Serenoah

• serene,
• serin,
• Serrano,
• serino,
• serano,
• Sereno,
• Sieren,
• Serena.

The adjective form of the word "serenoa" would be "serenoa".

The plural form of the word "serenoa" is "serenoas".

The singular form of the word "serenoa" is "serenoa" itself. The word does not change in form when referring to a single object or entity.