Eucalyptus globulus vs blue gum

Eucalyptus globulus and blue gum both are nouns.

Word	Noun	Adjective	Verb	Adverb
Eucalyptus globulus	Yes	No	No	No
blue gum	Yes	No	No	No

As nouns, Eucalyptus globulus and blue gum are synonyms defined as:

Eucalyptus globulus and blue gum: tall fast-growing timber tree with leaves containing a medicinal oil; young leaves are bluish

Other synonyms of Eucalyptus globulus include fever tree.

Eucalyptus globulus (noun)	blue gum (noun)
tall fast-growing timber tree with leaves containing a medicinal oil; young leaves are bluish	tall fast-growing timber tree with leaves containing a medicinal oil; young leaves are bluish