gum tree vs tupelo tree

gum tree and tupelo tree both are nouns.

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

As nouns, tupelo tree is a hyponym of gum tree; that is, tupelo tree is a word with a more specific, narrower meaning than gum tree:

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

Other hyponyms of gum tree include liquidambar, eucalypt, eucalyptus, eucalyptus tree, tupelo.

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