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“vault” in Latin

The English word vault itself goes back to Latin volvō, through *volta.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

vault s.
An arched roof, camera: concameratio: fornix (PROP., of single arches; then the whole vault).
An arched place, concameratio: locus concameratus. A vault under ground, hypogeum (e.g., for the dead, Petronius, Sat., 11); locus sub terra saxo conseptus (Liv., 22, 57).
A place for keeping things in, cella (a store-room): horreum (a warehouse for goods): taberna (a shop).
vault v.
Transitively, camerare (Plin.): concamerare (all round): confornicare (Vitr., completely). To be vaulted, fornicatim curvari (Plin.); concamerari. Vaulted, cameratus; concameratus; fornicatus (vaulted): arcuatus (arched): convexus; gibbus (half round, convex; opposed to concavus, gibbus; Cels., 8, 1, in.).
Intransitively, saltu se subjicere: saltu emicare. To vault on a horse, in equum insilire; saltu se subjicere in equum.

Quick answer

What is the Latin word for vault?
The usual Latin words for “vault” are camera, concămĕrātĭo, fornix; also cella, horreum, taberna. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.