red willow vs Salix purpurea

red willow and Salix purpurea both are nouns.

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

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

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

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

red willow (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