roundsman

noun
1
a person who delivers things to people in a particular area
تحویل‌دهنده, پیک, پیکرسان, تحویل‌گر
2
the police officer in charge of a group of officers that is moving around an area
افسر گشت, فرمانده گشت, مسئول گشت
3
a journalist who deals with a particular subject
خبرنگار متخصص, خبرنگار حوزه ویژه