river gum vs red gum

river gum and red gum both are nouns.

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

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