Salix pendulina vs willow

Salix pendulina and willow both are nouns.

Word	Noun	Adjective	Verb	Adverb
Salix pendulina	Yes	No	No	No
willow	Yes	No	No	No

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

Other hypernyms of Salix pendulina include willow tree.

Salix pendulina (noun)	willow (noun)
hybrid willow usually not strongly weeping in habit	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