• rollex,
• rolades,
• rolone,
• rolfde,
• POOdEX,
• eolodex,
• dolodex,
• folodex,
• tolodex,
• 5olodex,
• 4olodex,
• holodec,
• Roiodon,
• Rolfode,
• roulode,
• rulodes,
• Ropolec,
• Polyosex,
• Roledex,
• Rollo-Dex

The plural form of the word "Rolodex" is "Rolodexes".

The singular form of the word "Rolodex" is "Rolodex". The word is both singular and plural since it is a trademark and specific product name for a rotating file device used to store and organize contact information. However, in general usage, some people may use "Rolodex" as both singular and plural, while others may use "Rolodexes" to refer to multiple units.