Sierra plum vs Pacific plum

Sierra plum and Pacific plum both are nouns.

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

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

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

Other synonyms of Sierra plum include Prunus subcordata.

Sierra plum (noun)	Pacific 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