Tabernacle. In a Catholic church, the place where the Blessed Sacrament is reserved between Masses. It is usually a free-standing cupboard, but may be built into the back of an altar. Where the sacrament is reserved in an Anglican church, it is usually in an aumbry. In medieval days, the sacrament was usually reserved in a pyx.
Tabernacle work is something quite different. This means the decorating of a reredos, font cover, porch, etc, with canopied niches containing figures.