subalpine larch vs larch

subalpine larch and larch both are nouns.

Word	Noun	Adjective	Verb	Adverb
subalpine larch	Yes	No	No	No
larch	Yes	No	No	No

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

subalpine larch: medium-sized larch of the Rocky Mountains; closely related to Larix occidentalis
larch: any of numerous conifers of the genus Larix all having deciduous needlelike leaves

Other hypernyms of subalpine larch include larch tree.

subalpine larch (noun)	larch (noun)
medium-sized larch of the Rocky Mountains; closely related to Larix occidentalis	any of numerous conifers of the genus Larix all having deciduous needlelike leaves
	wood of a larch tree