western larch vs western tamarack

western larch and western tamarack both are nouns.

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

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

western 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 western larch include Larix occidentalis, Oregon larch.

western 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