Rhamnus frangula vs alder dogwood

Rhamnus frangula and alder dogwood both are nouns.

Word	Noun	Adjective	Verb	Adverb
Rhamnus frangula	Yes	No	No	No
alder dogwood	Yes	No	No	No

As nouns, Rhamnus frangula and alder dogwood are synonyms defined as:

Other synonyms of Rhamnus frangula include alder buckthorn.

Rhamnus frangula (noun)	alder dogwood (noun)
small tree common in Europe	small tree common in Europe