emperor vs vinifera grape

emperor and vinifera grape both are nouns.

Word	Noun	Adjective	Verb	Adverb
emperor	Yes	No	No	No
vinifera grape	Yes	No	No	No

As nouns, vinifera grape is a hypernym of emperor; that is, vinifera grape is a word with a broader meaning than emperor:

emperor: red table grape of California
vinifera grape: grape from a cultivated variety of the common grape vine of Europe

emperor (noun)	vinifera grape (noun)
large richly colored butterfly	grape from a cultivated variety of the common grape vine of Europe
large moth of temperate forests of Eurasia having heavily scaled transparent wings	common European grape cultivated in many varieties; chief source of Old World wine and table grapes
red table grape of California
the male ruler of an empire