American larch vs larch

American larch and larch both are nouns.

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

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

American larch: medium-sized larch of Canada and northern United States including Alaska having a broad conic crown and rust-brown scaly bark
larch: any of numerous conifers of the genus Larix all having deciduous needlelike leaves

Other hypernyms of American larch include larch tree.

American larch (noun)	larch (noun)
medium-sized larch of Canada and northern United States including Alaska having a broad conic crown and rust-brown scaly bark	any of numerous conifers of the genus Larix all having deciduous needlelike leaves
	wood of a larch tree