Larix occidentalis vs Oregon larch

Larix occidentalis and Oregon larch both are nouns.

Word	Noun	Adjective	Verb	Adverb
Larix occidentalis	Yes	No	No	No
Oregon larch	Yes	No	No	No

As nouns, Larix occidentalis and Oregon larch are synonyms defined as:

Larix occidentalis and Oregon larch: tall larch of western North America have pale green sharply pointed leaves and oblong cones; an important timber tree

Other synonyms of Larix occidentalis include western larch, western tamarack.

Larix occidentalis (noun)	Oregon larch (noun)
tall larch of western North America have pale green sharply pointed leaves and oblong cones; an important timber tree	tall larch of western North America have pale green sharply pointed leaves and oblong cones; an important timber tree