Oregon alder vs red alder

Oregon alder and red alder both are nouns.

Word	Noun	Adjective	Verb	Adverb
Oregon alder	Yes	No	No	No
red alder	Yes	No	No	No

As nouns, Oregon alder and red alder are synonyms defined as:

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

Other synonyms of Oregon alder include Alnus rubra.

Oregon alder (noun)	red 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