complete

1. Origins, structure, and basic meaning

• Structure: 完 conveys completion; its on-reading is かん.
• Basic usage: 完成（かんせい） refers to something being completed or made whole, while 完了（かんりょう） refers to finishing a task or procedure.

2. Common pitfalls and similar expressions

• A finished result and a completed procedure
  • 完成 is used when a bridge has been built or a model is being finished. 模型の完成まで means until the model is complete.
  • 完了 is used for completed inspections or payments. 支払いの完了 means completion of the payment process.