red osier vs Salix purpurea

red osier and Salix purpurea both are nouns.

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

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

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

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

red 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
common North American shrub with reddish purple twigs and white flowers