conductor (one who conducts a musical performance)

eunuch; one who was castrated / castrator; one who castrates

a patriot (person who loves, supports and defends their country)

popular person

one who wanders without a residence or a job. (since the end of nineteenth century) / (misuse of 浮浪人) one who flees their lands to escape taxation. (Ritsuryo system since seventh century)

owner; proprietor; possessor

organizer

technician, engineer

researcher

operator