maypop vs passionflower vine

maypop and passionflower vine both are nouns.

Word	Noun	Adjective	Verb	Adverb
maypop	Yes	No	No	No
passionflower vine	Yes	No	No	No

As nouns, passionflower vine is a hypernym of maypop; that is, passionflower vine is a word with a broader meaning than maypop:

maypop: of southern United States; having an insipid berry the size of a hen egg
passionflower vine: any of various chiefly tropical American vines some bearing edible fruit

Other hypernyms of maypop include passionflower.

maypop (noun)	passionflower vine (noun)
of southern United States; having an insipid berry the size of a hen egg	any of various chiefly tropical American vines some bearing edible fruit