surface area vs expanse

surface area and expanse both are nouns.

Word	Noun	Adjective	Verb	Adverb
surface area	Yes	No	No	No
expanse	Yes	No	No	No

As nouns, surface area and expanse are synonyms defined as:

surface area and expanse: the extent of a 2-dimensional surface enclosed within a boundary

Other synonyms of surface area include area.

surface area (noun)	expanse (noun)
the extent of a 2-dimensional surface enclosed within a boundary	the extent of a 2-dimensional surface enclosed within a boundary
	a wide scope
	a wide and open space or area as of surface or land or sky