siding vs weatherboard

siding and weatherboard both are nouns.

Word	Noun	Adjective	Verb	Adverb
siding	Yes	No	No	No
weatherboard	Yes	No	No	No

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

siding: material applied to the outside of a building to make it weatherproof
weatherboard: a long thin board with one edge thicker than the other; used as siding by lapping one board over the board below

Other hyponyms of siding include clapboard, weatherboarding.

siding (noun)	weatherboard (noun)
a short stretch of railroad track used to store rolling stock or enable trains on the same line to pass	the side toward the wind
material applied to the outside of a building to make it weatherproof	a long thin board with one edge thicker than the other; used as siding by lapping one board over the board below