fever tree vs genus Acacia

fever tree and genus Acacia both are nouns.

Word	Noun	Adjective	Verb	Adverb
fever tree	Yes	No	No	No
genus Acacia	Yes	No	No	No

fever tree (noun)	genus Acacia (noun)
any of several trees having leaves or bark used to allay fever or thought to indicate regions free of fever	large genus of shrubs and trees and some woody vines of Central and South America, Africa, Australia and Polynesia: wattle; mimosa
ornamental shrub or small tree of swampy areas in southwestern United States having large pink or white sepals and yielding Georgia bark for treating fever
tall fast-growing timber tree with leaves containing a medicinal oil; young leaves are bluish
African tree supposed to mark healthful regions