red osier vs red osier dogwood

red osier and red osier dogwood both are nouns.

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

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

red osier and red osier dogwood: common North American shrub with reddish purple twigs and white flowers

Other synonyms of red osier include American dogwood, Cornus stolonifera, red dogwood, redbrush.

red osier (noun)	red osier dogwood (noun)
Eurasian osier having reddish or purple twigs and bark rich in tannin	common North American shrub with reddish purple twigs and white flowers
common North American shrub with reddish purple twigs and white flowers