- 問題【もんだい】 - question (e.g. on a test), problem, problem (e.g. societal, political), question, issue, subject (e.g. of research), case, matter, question (i.e. doubt), public discussion, controversy, trouble, problem, inconvenience, difficulty 
- 質問【しつもん】 - question, inquiry, enquiry 
- 疑問【ぎもん】 - doubt, question, suspicion, dubiousness 
- 問う【とう】 - to ask, to inquire, to blame (someone) for, to accuse of, to pursue (question of responsibility), to charge with, to care about, to regard as important, to call into question, to doubt, to question 
- 拷問【ごうもん】 - torture 
- 尋問【じんもん】 - questioning, interrogation, examination (of a witness) 
- 訪問【ほうもん】 - call, visit 
- 顧問【こもん】 - adviser, advisor, consultant 
- 時間の問題【じかんのもんだい】 - matter of time, question of time 
- 問い【とい】 - question, query 
- 難問【なんもん】 - perplexity, difficult question, difficult problem 
- 学問【がくもん】 - study, scholarship, learning, education, knowledge, discipline, branch of learning, (a) science 
- 問屋【とんや】 - wholesale store, wholesale dealer, wholesaler 
- 問い合わせる【といあわせる】 - to enquire, to inquire, to seek information 
- 別問題【べつもんだい】 - different thing, another question, different case 
- 問答【もんどう】 - questions and answers, dialogue 
- 自問【じもん】 - asking oneself 
- 押し問答【おしもんどう】 - arguing back and forth, bandying words, verbal tug-of-war 
- 慰問【いもん】 - visit to console someone, giving comfort (to the sick, injured, etc.), expressing condolences (sympathy, concern, etc.), sympathy call 
- 問い合わせ【といあわせ】 - enquiry, inquiry, query