purple osier vs red willow

purple osier and red willow both are nouns.

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

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

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

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

purple osier (noun)	red 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