coffeeberry vs California buckthorn

coffeeberry and California buckthorn both are nouns.

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

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

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

Other synonyms of coffeeberry include California coffee, Rhamnus californicus.

coffeeberry (noun)	California buckthorn (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