California buckthorn vs coffeeberry

California buckthorn and coffeeberry both are nouns.

Word	Noun	Adjective	Verb	Adverb
California buckthorn	Yes	No	No	No
coffeeberry	Yes	No	No	No

As nouns, California buckthorn and coffeeberry are synonyms defined as:

California buckthorn and coffeeberry: evergreen shrub of western United States bearing small red or black fruits

Other synonyms of California buckthorn include California coffee, Rhamnus californicus.

California buckthorn (noun)	coffeeberry (noun)
evergreen shrub of western United States bearing small red or black fruits	evergreen shrub of western United States bearing small red or black fruits