roast vs roaster

roast and roaster both are nouns.

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

roast (noun)	roaster (noun)
negative criticism	a special cooking pan for roasting
a piece of meat roasted or for roasting and of a size for slicing into more than one portion	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)

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

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