black larch vs American larch

black larch and American larch both are nouns.

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

As nouns, black larch and American larch are synonyms defined as:

black larch and American larch: medium-sized larch of Canada and northern United States including Alaska having a broad conic crown and rust-brown scaly bark

Other synonyms of black larch include Larix laricina, tamarack.

black larch (noun)	American larch (noun)
medium-sized larch of Canada and northern United States including Alaska having a broad conic crown and rust-brown scaly bark	medium-sized larch of Canada and northern United States including Alaska having a broad conic crown and rust-brown scaly bark