purple osier vs Salix purpurea

purple osier and Salix purpurea both are nouns.

Word	Noun	Adjective	Verb	Adverb
purple osier	Yes	No	No	No
Salix purpurea	Yes	No	No	No

As nouns, purple osier and Salix purpurea are synonyms defined as:

purple osier and Salix purpurea: Eurasian osier having reddish or purple twigs and bark rich in tannin

Other synonyms of purple osier include basket willow, purple willow, red osier, red willow.

purple osier (noun)	Salix purpurea (noun)
Eurasian osier having reddish or purple twigs and bark rich in tannin	Eurasian osier having reddish or purple twigs and bark rich in tannin