genus Quassia vs quassia

genus Quassia and quassia both are nouns.

Word	Noun	Adjective	Verb	Adverb
genus Quassia	Yes	No	No	No
quassia	Yes	No	No	No

genus Quassia (noun)	quassia (noun)
tropical trees and shrubs with pinnate leaves and large scarlet flowers; bark is medicinal	handsome South American shrub or small tree having bright scarlet flowers and yielding a valuable fine-grained yellowish wood; yields the bitter drug quassia from its wood and bark
	a bitter compound used as an insecticide and tonic and vermifuge; extracted from the wood and bark of trees of the genera Quassia and Picrasma