モン
かど、と
門
門
gates
部門(ぶもん): division (of a larger group); branch; field; class (subclass); group; category; department
専門(せんもん): speciality; specialty; subject of study; expert
門(もん): (1) gate (2) branch of learning based on the teachings of a single master (3) (biological) division (4) counter for cannons
正門(せいもん): main gate; main entrance