Carissa macrocarpa vs carissa

Carissa macrocarpa and carissa both are nouns.

Word	Noun	Adjective	Verb	Adverb
Carissa macrocarpa	Yes	No	No	No
carissa	Yes	No	No	No

As nouns, carissa is a hypernym of Carissa macrocarpa; that is, carissa is a word with a broader meaning than Carissa macrocarpa:

Carissa macrocarpa: very large closely branched South African shrub having forked bright green spines and shiny leaves
carissa: a shrub of the genus Carissa having fragrant white flowers and plumlike red to purple-black fruits

Carissa macrocarpa (noun)	carissa (noun)
very large closely branched South African shrub having forked bright green spines and shiny leaves	a shrub of the genus Carissa having fragrant white flowers and plumlike red to purple-black fruits