surface area vs balk

surface area and balk both are nouns.

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

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

surface area: the extent of a 2-dimensional surface enclosed within a boundary
balk: the area on a billiard table behind the balkline

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

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

surface area (verb)	balk (verb)
	refuse to comply