Apse and Oriel

Apse noun - A domed or vaulted recess or projection on a building especially the east end of a church; usually contains the altar.

Oriel and apse are semantically related in niche topic. In some cases you can use "Oriel" instead a noun "Apse".

Oriel noun - A projecting bay window corbeled or cantilevered out from a wall.

Apse and oriel are semantically related in niche topic. You can use "Apse" instead a noun "Oriel".