Oregon larch vs larch tree

Oregon larch and larch tree both are nouns.

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

As nouns, larch tree is a hypernym of Oregon larch; that is, larch tree is a word with a broader meaning than Oregon larch:

Oregon larch: tall larch of western North America have pale green sharply pointed leaves and oblong cones; an important timber tree
larch tree: any of numerous conifers of the genus Larix all having deciduous needlelike leaves

Other hypernyms of Oregon larch include larch.

Oregon larch (noun)	larch tree (noun)
tall larch of western North America have pale green sharply pointed leaves and oblong cones; an important timber tree	any of numerous conifers of the genus Larix all having deciduous needlelike leaves