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