kiln vs muffle

kiln and muffle both are nouns.

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

As nouns, muffle is a hyponym of kiln; that is, muffle 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
muffle: a kiln with an inner chamber for firing things at a low temperature

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

kiln (noun)	muffle (noun)
a furnace for firing or burning or drying such things as porcelain or bricks	a kiln with an inner chamber for firing things at a low temperature

kiln (verb)	muffle (verb)
	suppress in order to conceal or hide
	deaden (a sound or noise), especially by wrapping