American red plum vs Prunus americana

American red plum and Prunus americana both are nouns.

Word	Noun	Adjective	Verb	Adverb
American red plum	Yes	No	No	No
Prunus americana	Yes	No	No	No

As nouns, American red plum and Prunus americana are synonyms defined as:

American red plum and Prunus americana: wild plum trees of eastern and central North America having red-orange fruit with yellow flesh

Other synonyms of American red plum include August plum, goose plum.

American red plum (noun)	Prunus americana (noun)
wild plum trees of eastern and central North America having red-orange fruit with yellow flesh	wild plum trees of eastern and central North America having red-orange fruit with yellow flesh