We don't have synonyms for mastabas yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are mastaba, mastabah and mastabahs.
(n) :
(architecture) A rectangular structure with a flat top and slightly sloping sides, built during Ancient Egyptian times above tombs that were situated on flat land. Mastabas were made of wood, mud bricks, stone, or a combination of these materials. Some are solid structures, while others can contain one or more rooms, sometimes decorated with paintings or inscriptions.
(n) :
A wide stone bench built into the wall of a house, shop etc. in the Middle East.
(n) :
(architecture) A rectangular structure with a flat top and slightly sloping sides, built during Ancient Egyptian times above tombs that were situated on flat land. Mastabas were made of wood, mud bricks, stone, or a combination of these materials. Some are solid structures, while others can contain one or more rooms, sometimes decorated with paintings or inscriptions.
(n) :
A wide stone bench built into the wall of a house, shop etc. in the Middle East.