Oregon larch vs western larch

Oregon larch and western larch both are nouns.

Word	Noun	Adjective	Verb	Adverb
Oregon larch	Yes	No	No	No
western larch	Yes	No	No	No

As nouns, Oregon larch and western larch are synonyms defined as:

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

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

Oregon larch (noun)	western 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