Salix purpurea vs purple willow

Salix purpurea and purple willow both are nouns.

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

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

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

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

Salix purpurea (noun)	purple willow (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