tupelo tree vs gum tree

tupelo tree and gum tree both are nouns.

Word	Noun	Adjective	Verb	Adverb
tupelo tree	Yes	No	No	No
gum tree	Yes	No	No	No

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

tupelo tree: any of several gum trees of swampy areas of North America
gum tree: any of various trees of the genera Eucalyptus or Liquidambar or Nyssa that are sources of gum

Other hypernyms of tupelo tree include gum.

tupelo tree (noun)	gum tree (noun)
any of several gum trees of swampy areas of North America	any of various trees of the genera Eucalyptus or Liquidambar or Nyssa that are sources of gum