purple osier vs red osier

purple osier and red osier both are nouns.

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

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

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

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

purple osier (noun)	red 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
	common North American shrub with reddish purple twigs and white flowers