分類

1. Origins, structure, and basic meaning

• Structure: 分類 (ぶんるい) combines dividing 分 and kind 類 to denote grouping items by a criterion.
• Basic usage: It applies to sorting leaves by shape and color or organizing books by subject.

2. Common pitfalls and similar expressions

• Classifying versus being classified
  • 分類した presents the act of sorting, while 分類されている presents the resulting organized state.