conundrum /kə-nunˈdrəm/

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

• idioblastic
• idioblasts
• idiocies
• idiocy
• idioglossia
• idioglossias
• idiogram
• idiograms
• idiograph
• idiographic
• idiographs
• idiolect
• idiolectal
• idiolectic
• idiolects
• idiom
• idiomatic
• idiomatical
• idiomatically
• Idiom Neutral
• idiomorphic
• idioms
• idiopathic
• idiopathically
• idiopathies