red osier dogwood vs red osier

red osier dogwood and red osier both are nouns.

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

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

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

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

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