Synonyms of basement
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cryptA crypt is an underground room underneath a church or cathedral.
• people buried in the crypt of an old London church
vaultA vault is a room underneath a church or in a cemetery where people are buried, usually the members of a single family.
• He ordered that Matilda's body should be buried in the family vault.
Thesaurus for basement from the Collins English Thesaurus
a partly or wholly underground storey of a building, esp the one immediately below the main floor