expanse vs section

expanse and section both are nouns.

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

As nouns, section is a hyponym of expanse; that is, section is a word with a more specific, narrower meaning than expanse:

Other hyponyms of expanse include acreage, land area, footprint, erasure, blank space, place, space, space, balk, baulk, plane section.

expanse (noun)	section (noun)
the extent of a 2-dimensional surface enclosed within a boundary	the cutting of or into body tissues or organs (especially by a surgeon as part of an operation)
a wide scope	one of several parts or pieces that fit with others to constitute a whole object
a wide and open space or area as of surface or land or sky	one of the portions into which something is regarded as divided and which together constitute a whole
	a self-contained part of a larger composition (written or musical)
	a segment of a citrus fruit
	a small army unit usually having a special function
	a division of an orchestra containing all instruments of the same class
	a small team of policemen working as part of a police platoon
	a specialized division of a large organization
	a small class of students who are part of a larger course but are taught separately
	(geometry) the area created by a plane cutting through a solid
	a distinct region or subdivision of a territorial or political area or community or group of people
	a very thin slice (of tissue or mineral or other substance) for examination under a microscope
	a land unit equal to 1 square mile

expanse (verb)	section (verb)
	divide into segments