red willow vs purple osier

red willow and purple osier both are nouns.

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

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

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

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

red 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