cinchona vs cinchona bark

cinchona and cinchona bark both are nouns.

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

As nouns, cinchona and cinchona bark are synonyms defined as:

cinchona and cinchona bark: medicinal bark of cinchona trees; source of quinine and quinidine

Other synonyms of cinchona include Jesuit's bark, Peruvian bark.

cinchona (noun)	cinchona bark (noun)
any of several trees of the genus Cinchona	medicinal bark of cinchona trees; source of quinine and quinidine
medicinal bark of cinchona trees; source of quinine and quinidine