volaille vs roaster

volaille and roaster both are nouns.

Word	Noun	Adjective	Verb	Adverb
volaille	Yes	No	No	No
roaster	Yes	No	No	No

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

Other hyponyms of volaille include broiler, capon, frier, fryer, pullet, spatchcock, hen.

volaille (noun)	roaster (noun)
the flesh of a chicken used for food	a special cooking pan for roasting
	flesh of a large young chicken over 3 1/2 lb suitable for roasting
	a cook who roasts food
	a harsh or humorous critic (sometimes intended as a facetious compliment)