purple willow vs purple osier

purple willow and purple osier both are nouns.

Word	Noun	Adjective	Verb	Adverb
purple willow	Yes	No	No	No
purple osier	Yes	No	No	No

As nouns, purple willow and purple osier are synonyms defined as:

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

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

purple willow (noun)	purple osier (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