red dogwood vs red osier

red dogwood and red osier both are nouns.

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

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

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

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

red 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
European deciduous shrub turning red in autumn having dull white flowers	common North American shrub with reddish purple twigs and white flowers