silky willow vs willow

silky willow and willow both are nouns.

Word	Noun	Adjective	Verb	Adverb
silky willow	Yes	No	No	No
willow	Yes	No	No	No

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

silky willow: 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 silky willow include willow tree.

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

silky willow: small shrubby tree of western North America (Alaska to Oregon)
willow: any of numerous deciduous trees and shrubs of the genus Salix

Other hypernyms of silky willow include willow tree.

silky willow (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
small shrubby tree of western North America (Alaska to Oregon)	any of numerous deciduous trees and shrubs of the genus Salix