opposite · versus

1. Origins, structure, and basic meaning

• Structure: 対 conveys a facing or opposing relationship; its on-readings include たい.
• Basic usage: 反対(はんたい) means opposition or the opposite side, while 対立(たいりつ) means conflict between opinions or parties.

2. Common pitfalls and similar expressions

• An opposite location and conflicting opinions
  • 計画に反対する means to oppose a plan, while 反対側 means the opposite side. 反対 is used for both opinions and locations.
  • 意見が対立した means that opinions were in conflict. 対立 focuses on an opposing relationship, distinct from simply describing a location on the other side of a station.