baulk vs surface area

baulk and surface area both are nouns.

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

As nouns, surface area is a hypernym of baulk; that is, surface area is a word with a broader meaning than baulk:

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

Other hypernyms of baulk include area, expanse.

baulk (noun)	surface area (noun)
one of several parallel sloping beams that support a roof	the extent of a 2-dimensional surface enclosed within a boundary
something immaterial that interferes with or delays action or progress
the area on a billiard table behind the balkline

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