redbrush vs red osier

redbrush and red osier both are nouns.

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

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

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

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

redbrush (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