magnolia vs bark

magnolia and bark both are nouns.

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

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

magnolia: dried bark of various magnolias; used in folk medicine
bark: tough protective covering of the woody stems and roots of trees and other woody plants

magnolia (noun)	bark (noun)
any shrub or tree of the genus Magnolia; valued for their longevity and exquisite fragrant blooms	a sailing ship with 3 (or more) masts
dried bark of various magnolias; used in folk medicine	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