• bumenius,
• mumenius,
• jumenius,
• humenius,
• nymenius,
• nhmenius,
• njmenius,
• nimenius,
• n8menius,
• n7menius,
• nunenius,
• nukenius,
• mnumenius,
• numernius,
• numeinus,
• numenuis,
• numinius,
• numinious,
• numinus,
• Numminius

The adjective form of the word "numenius" is "numenian".

The plural form of "numenius" is "numenii".

The singular form of the word "numenius" is "numenius". The word "numenius" is already in its singular form as it is a proper noun referring to a specific genus of birds.