brainteaser

As nouns the difference between brainteaser and conundrum

is that brainteaser is a difficult problem or puzzle while conundrum is a difficult question or riddle, especially one using a play on words in the answer.

As nouns the difference between riddle and brainteaser

is that riddle is a verbal puzzle, mystery, or other problem of an intellectual nature while brainteaser is {{cx|informal|lang=en}} A difficult problem or puzzle.

As a verb riddle

is to speak ambiguously or enigmatically.

As a proper noun Riddle

is {{surname|lang=en}.