Nyssa aquatica vs tupelo tree

Nyssa aquatica and tupelo tree both are nouns.

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

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

Nyssa aquatica: columnar swamp tree of southeastern to midwestern North America yielding pale soft easily worked wood
tupelo tree: any of several gum trees of swampy areas of North America

Other hypernyms of Nyssa aquatica include tupelo.

Nyssa aquatica (noun)	tupelo tree (noun)
columnar swamp tree of southeastern to midwestern North America yielding pale soft easily worked wood	any of several gum trees of swampy areas of North America