Nyssa sylvatica vs tupelo tree

Nyssa sylvatica and tupelo tree both are nouns.

Word	Noun	Adjective	Verb	Adverb
Nyssa sylvatica	Yes	No	No	No
tupelo tree	Yes	No	No	No

As nouns, tupelo tree is a hypernym of Nyssa sylvatica; that is, tupelo tree is a word with a broader meaning than Nyssa sylvatica:

Nyssa sylvatica: columnar tree of eastern North America having horizontal limbs and small leaves that emerge late in spring and have brilliant color in early fall
tupelo tree: any of several gum trees of swampy areas of North America

Other hypernyms of Nyssa sylvatica include tupelo.

Nyssa sylvatica (noun)	tupelo tree (noun)
columnar tree of eastern North America having horizontal limbs and small leaves that emerge late in spring and have brilliant color in early fall	any of several gum trees of swampy areas of North America