red willow vs purple willow

red willow and purple willow both are nouns.

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

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

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

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

red willow (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