Larix lyallii vs subalpine larch

Larix lyallii and subalpine larch both are nouns.

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

As nouns, Larix lyallii and subalpine larch are synonyms defined as:

Larix lyallii and subalpine larch: medium-sized larch of the Rocky Mountains; closely related to Larix occidentalis

Larix lyallii (noun)	subalpine larch (noun)
medium-sized larch of the Rocky Mountains; closely related to Larix occidentalis	medium-sized larch of the Rocky Mountains; closely related to Larix occidentalis