Carissa bispinosa vs carissa

Carissa bispinosa and carissa both are nouns.

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

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

Carissa bispinosa: South African shrub having forked spines and plumlike fruit; frequently used as hedging
carissa: a shrub of the genus Carissa having fragrant white flowers and plumlike red to purple-black fruits

Carissa bispinosa (noun)	carissa (noun)
South African shrub having forked spines and plumlike fruit; frequently used as hedging	a shrub of the genus Carissa having fragrant white flowers and plumlike red to purple-black fruits