• pironga,
• piringia,
• pirangia,
• pironjia,
• pirongea,
• pirongiya,
• perongia,
• pirongai,
• perrongia,
• pyrongia

• pirogue,
• piranha,
• pronghorn,
• prong,
• peroxide,
• prunus,
• pirouette,
• piracy,
• Pyring.

The adjective form of the word "pirongia" would be "pirongian". However, it is important to note that "pirongia" is primarily a proper noun referring to a place in New Zealand, so the adjective form may not be commonly used.

The plural form of the word "pirongia" is also "pirongia".

The singular form of "pirongia" is still "pirongia". The word "pirongia" is a proper noun, referring to a specific place or entity, and does not have a commonly used singular form.