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)
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
内部【ないぶ】
interior, inside, internal
学部【がくぶ】
department of a university, undergraduate (course, program, etc.)
部屋【へや】
room, chamber, apartment, flat, pad, stable
部隊【ぶたい】
force, unit, corps, squad, troops, party
文部省【もんぶしょう】
Ministry of Education, Science and Culture (1871-2001)
部品【ぶひん】
parts, accessories, components
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)
西部【せいぶ】
western part, the west (of a region), the West (United States)
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)
大部分【だいぶぶん】
most part, greater part, majority