chicken vs roaster

chicken and roaster both are nouns.

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

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

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

chicken (noun)	roaster (noun)
a domestic fowl bred for flesh or eggs; believed to have been developed from the red jungle fowl	a special cooking pan for roasting
a foolhardy competition; a dangerous activity that is continued until one competitor becomes afraid and stops	flesh of a large young chicken over 3 1/2 lb suitable for roasting
the flesh of a chicken used for food	a cook who roasts food
a person who lacks confidence, is irresolute and wishy-washy	a harsh or humorous critic (sometimes intended as a facetious compliment)

chicken (adjective)	roaster (adjective)
easily frightened