natal plum vs carissa plum

natal plum and carissa plum both are nouns.

Word	Noun	Adjective	Verb	Adverb
natal plum	Yes	No	No	No
carissa plum	Yes	No	No	No

As nouns, natal plum and carissa plum are synonyms defined as:

natal plum and carissa plum: edible scarlet plumlike fruit of a South African plant

natal plum (noun)	carissa plum (noun)
edible scarlet plumlike fruit of a South African plant	edible scarlet plumlike fruit of a South African plant
very large closely branched South African shrub having forked bright green spines and shiny leaves
South African shrub having forked spines and plumlike fruit; frequently used as hedging