red osier dogwood vs red dogwood

red osier dogwood and red dogwood both are nouns.

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

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

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

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

red osier dogwood (noun)	red dogwood (noun)
common North American shrub with reddish purple twigs and white flowers	common North American shrub with reddish purple twigs and white flowers
	European deciduous shrub turning red in autumn having dull white flowers