whortleberry vs blueberry

whortleberry and blueberry both are nouns.

Word	Noun	Adjective	Verb	Adverb
whortleberry	Yes	No	No	No
blueberry	Yes	No	No	No

As nouns, blueberry is a hypernym of whortleberry; that is, blueberry is a word with a broader meaning than whortleberry:

whortleberry: erect European blueberry having solitary flowers and blue-black berries
blueberry: any of numerous shrubs of the genus Vaccinium bearing blueberries

Other hypernyms of whortleberry include blueberry bush.

whortleberry (noun)	blueberry (noun)
blue-black berries similar to American blueberries	sweet edible dark-blue berries of either low-growing or high-growing blueberry plants
erect European blueberry having solitary flowers and blue-black berries	any of numerous shrubs of the genus Vaccinium bearing blueberries