red gum vs eucalyptus tree

red gum and eucalyptus tree both are nouns.

Word	Noun	Adjective	Verb	Adverb
red gum	Yes	No	No	No
eucalyptus tree	Yes	No	No	No

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

Other hypernyms of red gum include eucalypt, eucalyptus.

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

Other hypernyms of red gum include eucalypt, eucalyptus.

red gum (noun)	eucalyptus tree (noun)
red gum tree of Tasmania	a tree of the genus Eucalyptus
very large red gum tree
a North American tree of the genus Liquidambar having prickly spherical fruit clusters and fragrant sap
reddish-brown wood and lumber from heartwood of the sweet gum tree used to make furniture
reddish-brown dried gummy exudation from any of several trees of the genus Eucalyptus especially Eucalyptus camaldulensis