conundrum /kə-nunˈdrəm/

1. A riddle, esp one whose answer is a play on words
2. Any puzzling question

• ptarmigans
• PTE
• Pte
• pter-
• -ptera
• -pteran
• pteranodon
• pteranodons
• pteria
• Pterichthys
• Pteridium
• pteridologies
• pteridologist
• pteridologists
• pteridology
• pteridomania
• pteridomanias
• pteridophilist
• pteridophilists
• Pteridophyta
• pteridophyte
• pteridophytes
• pteridosperm
• pteridosperms
• pterin