Peruvian bark vs bark

Peruvian bark and bark both are nouns.

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

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

Peruvian bark: 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

Peruvian bark (noun)	bark (noun)
medicinal bark of cinchona trees; source of quinine and quinidine	a sailing ship with 3 (or more) masts
	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