imperial tomb; tomb of a Japanese emperor
Refers specifically to the burial site of a Japanese emperor. Often used in historical, archaeological, or official contexts.
The tomb of Emperor Nintoku is the largest keyhole-shaped burial mound in Japan.
Refers to ancient burial mounds in general, not limited to imperial tombs. 天皇陵 is a specific type of 古墳 designated as an imperial mausoleum.
Compound of 天皇 (emperor) and 陵 (mausoleum, imperial tomb).