円墳

1. Origins, structure, and basic meaning

• Structure: 円墳（えんぷん） combines 円, roundness, with 墳, a tomb.
• Basic usage: It names a round burial mound and appears in accounts of discoveries or descriptions of its structure.

2. Common pitfalls and similar expressions

• Shape and size
  • 円墳 classifies the mound by shape. 小さな separately adds its size in the first example.
• The compound's sound
  • In this word, 墳 is pronounced ぷん.