Salix alba vitellina vs osier

Salix alba vitellina and osier both are nouns.

Word	Noun	Adjective	Verb	Adverb
Salix alba vitellina	Yes	No	No	No
osier	Yes	No	No	No

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

Salix alba vitellina: 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

Salix alba vitellina (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