Larix lyallii vs larch

Larix lyallii and larch both are nouns.

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

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

Larix lyallii: 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 Larix lyallii include larch tree.

Larix lyallii (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