Oregon alder vs alder tree

Oregon alder and alder tree both are nouns.

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

As nouns, alder tree is a hypernym of Oregon alder; that is, alder tree is a word with a broader meaning than Oregon alder:

Oregon alder: large tree of Pacific coast of North America having hard red wood much used for furniture
alder tree: north temperate shrubs or trees having toothed leaves and conelike fruit; bark is used in tanning and dyeing and the wood is rot-resistant

Other hypernyms of Oregon alder include alder.

Oregon alder (noun)	alder tree (noun)
large tree of Pacific coast of North America having hard red wood much used for furniture	north temperate shrubs or trees having toothed leaves and conelike fruit; bark is used in tanning and dyeing and the wood is rot-resistant