das Gewölbe
vault
An arched ceiling or roof structure, often found in churches, cellars, or old buildings.
Das gotische Gewölbe der Kathedrale war beeindruckend hoch.
The Gothic vault of the cathedral was impressively high.

vault
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vault
An arched ceiling or roof structure, often found in churches, cellars, or old buildings.
Das gotische Gewölbe der Kathedrale war beeindruckend hoch.
The Gothic vault of the cathedral was impressively high.

'Gewölbe' (vault) is derived from the verb 'wölben' (to arch something). The prefix 'Ge-' here, as often in German, forms a noun from a verb that describes the result of the action.
Die Brücke wölbt sich elegant über den Fluss.
The bridge arches elegantly over the river.
You can tell from the context whether an architectural 'Gewölbe' (vault) or a strongroom is meant. Words like 'Kirche' (church), 'Keller' (cellar), 'gotisch' (Gothic), or 'Decke' (ceiling) point to architecture. Words like 'Bank' (bank), 'Geld' (money), 'sicher' (secure), or 'Tresor' (safe) point to a room for protecting valuables.
Wir besichtigten den alten Weinkeller mit seinem steinernen Gewölbe.
We toured the old wine cellar with its stone vault.
In an architectural context, 'Gewölbe' (vault) is often combined with styles or materials. Typical phrases are 'ein gotisches Gewölbe' (a Gothic vault), 'ein romanisches Gewölbe' (a Romanesque vault), or 'ein steinernes Gewölbe' (a stone vault).
Das hohe Gewölbe der Kirche erzeugt eine besondere Akustik.
The high vault of the church creates a special acoustic effect.
When referring to a strongroom, people often speak of a 'Bankgewölbe' (bank vault). Typical verbs are 'etwas im Gewölbe lagern' (to store something in the vault), 'aufbewahren' (to keep/store), or 'einschließen' (to lock away).
Die wertvollen Dokumente werden sicher im Gewölbe aufbewahrt.
The valuable documents are kept securely in the vault.
blanket / ceiling
'die Decke' and 'das Gewölbe' can both refer to the upper part of a room. 'die Decke' is the general word for the surface above us in a room: the ceiling. 'das Gewölbe' is a special architectural form: it is curved and is often found in churches, cellars, or old buildings. They can be confused because a vault can also be a kind of ceiling. In a normal apartment, however, you almost always say 'Decke'. 'Gewölbe' is only used when the shape or the old architectural style is important.

In der alten Kirche bewundern die Besucher das hohe Gewölbe.
In the old church, visitors admire the high vault.
Im Wohnzimmer hängt eine Lampe an der Decke.
In the living room, a lamp is hanging from the ceiling.