A Visit, a Question and a Problem in Japanese

訪問 (hōmon) ... a visit

->  ok!  訪問する (hōmon-suru) ... to call on somebody

質問 (shitsumon) ... a question or questions

-> ok! 質問する (shitsumon-suru) ...  to ask a question or questions

問題 (mondai) ...  a problem or problems that should be solved

-> ng! 問題する (mondai-suru)

-> ok! 問題化する (mondai-suru) ... to problematize