刀剣

1. Origins, structure, and basic meaning

• Structure: 刀剣, read とうけん, groups single-edged sword 刀 with sword 剣 as a class of bladed weapons.
• Basic usage: It collectively denotes swords and bladed weapons, as in 各時代の刀剣.

2. Common pitfalls and similar expressions

• Scope and context
  • It suits classifying bladed weapons in museum, legal, or historical contexts more than naming one everyday knife.