acreage vs expanse

acreage and expanse both are nouns.

Word	Noun	Adjective	Verb	Adverb
acreage	Yes	No	No	No
expanse	Yes	No	No	No

As nouns, expanse is a hypernym of acreage; that is, expanse is a word with a broader meaning than acreage:

acreage: an area of ground used for some particular purpose (such as building or farming)
expanse: the extent of a 2-dimensional surface enclosed within a boundary

Other hypernyms of acreage include area, surface area.

acreage (noun)	expanse (noun)
an area of ground used for some particular purpose (such as building or farming)	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