Oregon ash vs Fraxinus oregona

Oregon ash and Fraxinus oregona both are nouns.

Word	Noun	Adjective	Verb	Adverb
Oregon ash	Yes	No	No	No
Fraxinus oregona	Yes	No	No	No

As nouns, Oregon ash and Fraxinus oregona are synonyms defined as:

Oregon ash and Fraxinus oregona: timber tree of western North America yielding hard light wood; closely related to the red ash

Other synonyms of Oregon ash include Fraxinus latifolia.

Oregon ash (noun)	Fraxinus oregona (noun)
timber tree of western North America yielding hard light wood; closely related to the red ash	timber tree of western North America yielding hard light wood; closely related to the red ash