Mastabas are ancient Egyptian burial structures that were typically constructed out of mud bricks or stone. These structures have a rectangular base and are usually flat-topped. There are several synonyms for the word mastaba, which can be used to describe this type of structure. One of the most common synonyms is "benben," which refers to a type of pyramid-shaped structure that was used in ancient Egypt as a symbol of the sun. Other synonyms for mastaba include "tomb," "funerary monument," "burial chamber," and "sarcophagus chamber." These terms can be used interchangeably to describe the unique architectural features of this ancient Egyptian structure.