Salix vitellina vs osier

Salix vitellina and osier both are nouns.

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

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

Salix 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 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