western tamarack vs Oregon larch

western tamarack and Oregon larch both are nouns.

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

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

western tamarack 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 western tamarack include Larix occidentalis, western larch.

western tamarack (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