Oregon alder vs Alnus rubra

Oregon alder and Alnus rubra both are nouns.

Word	Noun	Adjective	Verb	Adverb
Oregon alder	Yes	No	No	No
Alnus rubra	Yes	No	No	No

As nouns, Oregon alder and Alnus rubra are synonyms defined as:

Oregon alder and Alnus rubra: large tree of Pacific coast of North America having hard red wood much used for furniture

Other synonyms of Oregon alder include red alder.

Oregon alder (noun)	Alnus rubra (noun)
large tree of Pacific coast of North America having hard red wood much used for furniture	large tree of Pacific coast of North America having hard red wood much used for furniture