本部【ほんぶ】
headquarters, head office, main office
幹部【かんぶ】
management, (executive) staff, leaders, leadership, top brass, upper echelons
部分【ぶぶん】
portion, section, part
部門【ぶもん】
division (of a larger group), branch, field, class (subclass), group, category, department
部長【ぶちょう】
head (chief, director) of a section or department, head of a (school) club, head of a (school) team
一部【いちぶ】
one part, one portion, one section, some, one copy (e.g. of a document)
学部【がくぶ】
department of a university, undergraduate (course, program, etc.)
部屋【へや】
room, chamber, apartment, flat, pad, stable
内部【ないぶ】
interior, inside, internal
部隊【ぶたい】
force, unit, corps, squad, troops, party
部品【ぶひん】
parts, accessories, components
文部省【もんぶしょう】
Ministry of Education, Science and Culture (1871-2001)
全部【ぜんぶ】
all, entire, whole, altogether
支部【しぶ】
branch, subdivision
北部【ほくぶ】
northern part, the north (of a region)
南部【なんぶ】
southern part, the south (of a region)
外部【がいぶ】
outside (e.g. of a building), exterior, outside (of a group, company, etc.), outside world
西部【せいぶ】
western part, the west (of a region), the West (United States)
東部【とうぶ】
eastern part, the east (of a region)
大部分【だいぶぶん】
most part, greater part, majority