mezereum vs bark

mezereum and bark both are nouns.

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

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

mezereum: the dried bark of the shrub mezereon
bark: tough protective covering of the woody stems and roots of trees and other woody plants

mezereum (noun)	bark (noun)
the dried bark of the shrub mezereon	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