部門
ぶもん · bumon · JLPT N1 · noun
department
🏢 bu (part) + mon (gate/door): a part of a company, like a door into one room of it
部 = section or part; 門 = gate or door. A 部門 is a section of an organisation, the way each room has its own door.
部 — 阝(邑) right + 咅 phonetic
The right-side 阝 derives from 邑 (city/settlement), giving the meaning of a region, district, or administrative division. The left side 咅 supplies the sound. Originally referring to a settlement, the meaning broadened to 'part,' 'section,' or 'ministry.'