noun
memorial tower; stupa
A tower or monument built to honor and pray for the spirits of the deceased, often in a Buddhist context.
戦没者のために供養塔が建てられた。
A memorial tower was built for the war dead.
お寺の境内に古い供養塔がある。
There is an old memorial tower in the temple grounds.
墓 is a general term for a grave or tomb, whereas 供養塔 is a tower built for collective memorial rites, not an individual burial site.
Compound of 供養 (くよう, 'memorial service') and 塔 (とう, 'tower'). The exact historical derivation is uncertain, but the term is conventionally associated with Buddhist memorial structures.