mastaba vs mastabah

mastaba and mastabah both are nouns.

Word	Noun	Adjective	Verb	Adverb
mastaba	Yes	No	No	No
mastabah	Yes	No	No	No

As nouns, mastaba and mastabah are synonyms defined as:

mastaba and mastabah: an ancient Egyptian mud-brick tomb with a rectangular base and sloping sides and flat roof

mastaba (noun)	mastabah (noun)
an ancient Egyptian mud-brick tomb with a rectangular base and sloping sides and flat roof	an ancient Egyptian mud-brick tomb with a rectangular base and sloping sides and flat roof