roaster vs roast

roaster and roast both are nouns.

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

roaster (noun)	roast (noun)
a special cooking pan for roasting	negative criticism
flesh of a large young chicken over 3 1/2 lb suitable for roasting	a piece of meat roasted or for roasting and of a size for slicing into more than one portion
a cook who roasts food
a harsh or humorous critic (sometimes intended as a facetious compliment)

roaster (adjective)	roast (adjective)
	(meat) cooked by dry heat in an oven

roaster (verb)	roast (verb)
	cook with dry heat, usually in an oven
	subject to laughter or ridicule