Plymouth Rock vs poultry

Plymouth Rock and poultry both are nouns.

Word	Noun	Adjective	Verb	Adverb
Plymouth Rock	Yes	No	No	No
poultry	Yes	No	No	No

As nouns, poultry is a hypernym of Plymouth Rock; that is, poultry is a word with a broader meaning than Plymouth Rock:

Plymouth Rock: an American breed of domestic fowl
poultry: a domesticated gallinaceous bird thought to be descended from the red jungle fowl

Other hypernyms of Plymouth Rock include domestic fowl, fowl.

Plymouth Rock (noun)	poultry (noun)
an American breed of domestic fowl	a domesticated gallinaceous bird thought to be descended from the red jungle fowl
a boulder in Plymouth supposed to be where the Pilgrims disembarked from the Mayflower	flesh of chickens or turkeys or ducks or geese raised for food