gum tree vs eucalypt

gum tree and eucalypt both are nouns.

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

As nouns, eucalypt is a hyponym of gum tree; that is, eucalypt 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
eucalypt: a tree of the genus Eucalyptus

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

gum tree (noun)	eucalypt (noun)
any of various trees of the genera Eucalyptus or Liquidambar or Nyssa that are sources of gum	a tree of the genus Eucalyptus