Oregon larch vs western tamarack

Oregon larch and western tamarack both are nouns.

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

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

Oregon larch and western tamarack: 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 larch.

Oregon larch (noun)	western tamarack (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