Salix alba sericea vs willow

Salix alba sericea and willow both are nouns.

Word	Noun	Adjective	Verb	Adverb
Salix alba sericea	Yes	No	No	No
willow	Yes	No	No	No

As nouns, willow is a hypernym of Salix alba sericea; that is, willow is a word with a broader meaning than Salix alba sericea:

Salix alba sericea: North American willow with greyish silky pubescent leaves that usually blacken in drying
willow: any of numerous deciduous trees and shrubs of the genus Salix

Other hypernyms of Salix alba sericea include willow tree.

Salix alba sericea (noun)	willow (noun)
North American willow with greyish silky pubescent leaves that usually blacken in drying	a textile machine having a system of revolving spikes for opening and cleaning raw textile fibers
	any of numerous deciduous trees and shrubs of the genus Salix