kiln vs brickkiln

kiln and brickkiln both are nouns.

Word	Noun	Adjective	Verb	Adverb
kiln	Yes	No	No	No
brickkiln	Yes	No	No	No

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

kiln: a furnace for firing or burning or drying such things as porcelain or bricks
brickkiln: a kiln for making bricks

Other hyponyms of kiln include dry kiln, limekiln, muffle, oast.

kiln (noun)	brickkiln (noun)
a furnace for firing or burning or drying such things as porcelain or bricks	a kiln for making bricks