Alnus rubra vs Oregon alder

Alnus rubra and Oregon alder both are nouns.

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

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

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

Other synonyms of Alnus rubra include red alder.

Alnus rubra (noun)	Oregon alder (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