kerb vs curbing

kerb and curbing both are nouns.

Word	Noun	Adjective	Verb	Adverb
kerb	Yes	No	No	No
curbing	Yes	No	No	No

As nouns, kerb and curbing are synonyms defined as:

kerb and curbing: an edge between a sidewalk and a roadway consisting of a line of curbstones (usually forming part of a gutter)

Other synonyms of kerb include curb.

kerb (noun)	curbing (noun)
an edge between a sidewalk and a roadway consisting of a line of curbstones (usually forming part of a gutter)	an edge between a sidewalk and a roadway consisting of a line of curbstones (usually forming part of a gutter)