bush willow vs genus Combretum

bush willow and genus Combretum both are nouns.

Word	Noun	Adjective	Verb	Adverb
bush willow	Yes	No	No	No
genus Combretum	Yes	No	No	No

bush willow (noun)	genus Combretum (noun)
small deciduous tree of the Transvaal having spikes of yellow flowers	type genus of the Combretaceae: tropical and subtropical small shrubs and trees
small South African tree having creamy yellow fragrant flowers usually growing on stream banks