Oven Stuffer Roaster vs roaster

Oven Stuffer Roaster and roaster both are nouns.

Word	Noun	Adjective	Verb	Adverb
Oven Stuffer Roaster	Yes	No	No	No
roaster	Yes	No	No	No

As nouns, roaster is a hypernym of Oven Stuffer Roaster; that is, roaster is a word with a broader meaning than Oven Stuffer Roaster:

Oven Stuffer Roaster (noun)	roaster (noun)
a brand name for a roasting chicken	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)