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1. Origins, structure, and basic meaning

• Structure: The on reading is ぶ, and the kun reading is べ. It has 11 strokes and relates to one part of a whole or all of its parts.
• Basic usage: 一部 is read いちぶ, and 全部 is read ぜんぶ.

2. Common pitfalls and similar expressions

• 一部 / 全部
  • 一部 means part or one copy and is read いちぶ. It refers to one part of a whole or one copy of a document.
  • 壊れた壁の一部を新しい板に替えた。 means “We replaced part of the broken wall with a new board.”
  • 全部 means all or everything and is read ぜんぶ. It refers to all included items or the whole amount.
  • 机の上の本を全部読みました。 means “I read all the books on the desk.”