California buckthorn vs California coffee

California buckthorn and California coffee both are nouns.

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

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

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

Other synonyms of California buckthorn include coffeeberry, Rhamnus californicus.

California buckthorn (noun)	California coffee (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