cinchona vs bark

cinchona and bark both are nouns.

Word	Noun	Adjective	Verb	Adverb
cinchona	Yes	No	No	No
bark	Yes	No	Yes	No

As nouns, bark is a hypernym of cinchona; that is, bark is a word with a broader meaning than cinchona:

cinchona: medicinal bark of cinchona trees; source of quinine and quinidine
bark: tough protective covering of the woody stems and roots of trees and other woody plants

cinchona (noun)	bark (noun)
any of several trees of the genus Cinchona	a sailing ship with 3 (or more) masts
medicinal bark of cinchona trees; source of quinine and quinidine	the sound made by a dog
	a noise resembling the bark of a dog
	tough protective covering of the woody stems and roots of trees and other woody plants