peach-leaved willow vs willow

peach-leaved willow and willow both are nouns.

Word	Noun	Adjective	Verb	Adverb
peach-leaved willow	Yes	No	No	No
willow	Yes	No	No	No

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

peach-leaved willow: willow of the western United States with leaves like those of peach or almond trees
willow: any of numerous deciduous trees and shrubs of the genus Salix

Other hypernyms of peach-leaved willow include willow tree.

peach-leaved willow (noun)	willow (noun)
willow of the western United States with leaves like those of peach or almond trees	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