モン 
と.う と.い とん 
() question () ask () problem
                               
もん (suf,ctr) counter for questions
とい (n) question, query
といあわせ (n) enquiry, inquiry, ENQ, query, interrogation
といあわせる (v1) to enquire, to inquire, to seek information
とう (v5u-s,vt) (1) to ask, to question, to inquire, (2) to charge (i.e. with a crime), to accuse, (3) to care (about), (4) without regard to (with negative verb)
とんや (n) wholesale store
もんせき (n,vs) blame, censure, reproof, reprimand, rebuke
もんだい (n) problem, question
もんだいいしき (n) awareness of the issues
もんだいてん (n) the point at issue
もんどう (n,vs) questions and answers, dialogue

Links: KanjiDic: EDict : Wikimedia
Etymologies: 中文字譜 : 説文解字