oyster dressing vs stuffing

oyster dressing and stuffing both are nouns.

Word	Noun	Adjective	Verb	Adverb
oyster dressing	Yes	No	No	No
stuffing	Yes	No	No	No

As nouns, stuffing is a hypernym of oyster dressing; that is, stuffing is a word with a broader meaning than oyster dressing:

oyster dressing: stuffing made with oysters
stuffing: a mixture of seasoned ingredients used to stuff meats and vegetables

Other hypernyms of oyster dressing include dressing.

oyster dressing (noun)	stuffing (noun)
stuffing made with oysters	padding put in mattresses and cushions and upholstered furniture
	a mixture of seasoned ingredients used to stuff meats and vegetables