marri vs red gum

marri and red gum both are nouns.

Word	Noun	Adjective	Verb	Adverb
marri	Yes	No	No	No
red gum	Yes	No	No	No

As nouns, marri and red gum are synonyms defined as:

Other synonyms of marri include Eucalyptus calophylla.

marri (noun)	red gum (noun)
very large red gum tree	red gum tree of Tasmania
	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