red osier vs red dogwood

red osier and red dogwood both are nouns.

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

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

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

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

red osier (noun)	red 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	European deciduous shrub turning red in autumn having dull white flowers