beach plum vs Prunus maritima

beach plum and Prunus maritima both are nouns.

Word	Noun	Adjective	Verb	Adverb
beach plum	Yes	No	No	No
Prunus maritima	Yes	No	No	No

As nouns, beach plum and Prunus maritima are synonyms defined as:

beach plum and Prunus maritima: seacoast shrub of northeastern North America having showy white blossoms and edible purple fruit

Other synonyms of beach plum include beach plum bush.

beach plum (noun)	Prunus maritima (noun)
small dark purple fruit used especially in jams and pies	seacoast shrub of northeastern North America having showy white blossoms and edible purple fruit
seacoast shrub of northeastern North America having showy white blossoms and edible purple fruit