red osier vs American dogwood

red osier and American dogwood both are nouns.

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

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

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

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

red osier (noun)	American 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