expanse vs balk

expanse and balk both are nouns.

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

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

expanse (noun)	balk (noun)
the extent of a 2-dimensional surface enclosed within a boundary	an illegal pitching motion while runners are on base
a wide scope	one of several parallel sloping beams that support a roof
a wide and open space or area as of surface or land or sky	something immaterial that interferes with or delays action or progress
	the area on a billiard table behind the balkline

expanse (verb)	balk (verb)
	refuse to comply