Noun

• S: (n) riddle, conundrum, enigma, brain-teaser (a difficult problem)
• direct hypernym / inherited hypernym / sister term
• S: (n) problem (a question raised for consideration or solution) "our homework consisted of ten problems to solve"
• S: (n) question, head (the subject matter at issue) "the question of disease merits serious discussion"; "under the head of minor Roman poets"
• S: (n) subject, topic, theme (the subject matter of a conversation or discussion) "he didn't want to discuss that subject"; "it was a very sensitive topic"; "his letters were always on the theme of love"
• S: (n) message, content, subject matter, substance (what a communication that is about something is about)
• S: (n) communication (something that is communicated by or to or between people or groups)
• S: (n) abstraction, abstract entity (a general concept formed by extracting common features from specific examples)
• S: (n) entity (that which is perceived or known or inferred to have its own distinct existence (living or nonliving))
• derivationally related form
• W: (v) riddle [Related to: riddle] (speak in riddles)
• W: (v) riddle [Related to: riddle] (set a difficult problem or riddle) "riddle me a riddle"