river gum vs Eucalyptus rostrata

river gum and Eucalyptus rostrata both are nouns.

Word	Noun	Adjective	Verb	Adverb
river gum	Yes	No	No	No
Eucalyptus rostrata	Yes	No	No	No

As nouns, river gum and Eucalyptus rostrata are synonyms defined as:

river gum and Eucalyptus rostrata: somewhat crooked red gum tree growing chiefly along rivers; has durable reddish lumber used in heavy construction

Other synonyms of river gum include Eucalyptus camaldulensis, river red gum.

river gum (noun)	Eucalyptus rostrata (noun)
somewhat crooked red gum tree growing chiefly along rivers; has durable reddish lumber used in heavy construction	somewhat crooked red gum tree growing chiefly along rivers; has durable reddish lumber used in heavy construction