western tamarack vs western larch

western tamarack and western larch both are nouns.

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

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

western tamarack 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 western tamarack include Larix occidentalis, Oregon larch.

western tamarack (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