Cenotaph and Magnum opus

Cenotaph noun - A monument built to honor people whose remains are interred elsewhere or whose remains cannot be recovered.

Magnum opus and cenotaph are semantically related. in memorial topic. In some cases you can use "Magnum opus" instead a noun "Cenotaph".

Magnum opus noun - Something (as a work of art) that is a great achievement and often its creator's greatest achievement.

Cenotaph and magnum opus are semantically related. Sometimes you can use "Cenotaph" instead a noun phrase "Magnum opus".