winter's bark vs bark

winter's bark and bark both are nouns.

Word	Noun	Adjective	Verb	Adverb
winter's bark	Yes	No	No	No
bark	Yes	No	Yes	No

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

winter's bark: aromatic bark having tonic and stimulant properties
bark: tough protective covering of the woody stems and roots of trees and other woody plants

winter's bark (noun)	bark (noun)
South American evergreen tree yielding winter's bark and a light soft wood similar to basswood	a sailing ship with 3 (or more) masts
aromatic bark having tonic and stimulant properties	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