Ambulatory (Latin: ambulatorium, lit. “walking place”) is the covered passage around a cloister or the processional way around the east end of a cathedral or large church and behind the high altar.
English: Roof Lantern
Arcosolium: plural arcosolia, is an arched recess used as a place of entombment. The word is from Latin arcus, “arch”, and solium, “throne” (literally: “place of state”) or post-classical “sarcophagus”.
Apse of a church.
Source: Italian (arcella)
Large elevated arch, usually found in fours, each corner of which support the church dome.
Small church or chapel.
columbarium ( pl. columbaria): a place for the respectful and usually public storage of cinerary urns (those holding a deceased’s cremated remains).
Co-Cathedral: a cathedral church which shares the function of being a bishop’s seat, or cathedra, with another cathedral, often in another city (usually a former see, anchor city of the metropolitan area or the civil capital).
Choir: A. an organized group of singers, especially one that takes part in church services or performs in public. B. the part of a cathedral or large church between the high altar and the nave, used by the choir and clergy.
Crypt, an underground room or vault beneath a church, used as a chapel or burial place.
Small dome, cupola.
Font with holy water used in chruches.