Prunus nigra vs Canada plum

Prunus nigra and Canada plum both are nouns.

Word	Noun	Adjective	Verb	Adverb
Prunus nigra	Yes	No	No	No
Canada plum	Yes	No	No	No

As nouns, Prunus nigra and Canada plum are synonyms defined as:

Prunus nigra and Canada plum: small tree native to northeastern North America having oblong orange-red fruit

Prunus nigra (noun)	Canada plum (noun)
small tree native to northeastern North America having oblong orange-red fruit	small tree native to northeastern North America having oblong orange-red fruit