cayenne pepper vs Capsicum annuum longum

cayenne pepper and Capsicum annuum longum both are nouns.

Word	Noun	Adjective	Verb	Adverb
cayenne pepper	Yes	No	No	No
Capsicum annuum longum	Yes	No	No	No

As nouns, cayenne pepper and Capsicum annuum longum are synonyms defined as:

cayenne pepper and Capsicum annuum longum: plant bearing very hot and finely tapering long peppers; usually red

Other synonyms of cayenne pepper include cayenne, chili pepper, chilli pepper, jalapeno, long pepper.

cayenne pepper (noun)	Capsicum annuum longum (noun)
ground pods and seeds of pungent red peppers of the genus Capsicum	plant bearing very hot and finely tapering long peppers; usually red
a long and often twisted hot red pepper
plant bearing very hot and finely tapering long peppers; usually red