Pacific plum vs Sierra plum

Pacific plum and Sierra plum both are nouns.

Word	Noun	Adjective	Verb	Adverb
Pacific plum	Yes	No	No	No
Sierra plum	Yes	No	No	No

As nouns, Pacific plum and Sierra plum are synonyms defined as:

Pacific plum and Sierra plum: shrub of the Pacific coast of the United States bearing small red insipid fruit

Other synonyms of Pacific plum include Prunus subcordata.

Pacific plum (noun)	Sierra plum (noun)
shrub of the Pacific coast of the United States bearing small red insipid fruit	shrub of the Pacific coast of the United States bearing small red insipid fruit