golden willow vs osier

golden willow and osier both are nouns.

Word	Noun	Adjective	Verb	Adverb
golden willow	Yes	No	No	No
osier	Yes	No	No	No

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

golden willow: European willow having greyish leaves and yellow-orange twigs used in basketry
osier: any of various willows having pliable twigs used in basketry and furniture

golden willow (noun)	osier (noun)
European willow having greyish leaves and yellow-orange twigs used in basketry	any of various willows having pliable twigs used in basketry and furniture
	flexible twig of a willow tree