manna gum vs eucalyptus

manna gum and eucalyptus both are nouns.

Word	Noun	Adjective	Verb	Adverb
manna gum	Yes	No	No	No
eucalyptus	Yes	No	No	No

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

Other hypernyms of manna gum include eucalypt, eucalyptus tree.

manna gum (noun)	eucalyptus (noun)
tall tree yielding a false manna	a tree of the genus Eucalyptus
	wood of any of various eucalyptus trees valued as timber