cayenne pepper vs long pepper

cayenne pepper and long pepper both are nouns.

Word	Noun	Adjective	Verb	Adverb
cayenne pepper	Yes	No	No	No
long pepper	Yes	No	No	No

As nouns, cayenne pepper and long pepper are synonyms defined as:

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

Other synonyms of cayenne pepper include Capsicum annuum longum, cayenne, chili pepper, chilli pepper, jalapeno.

cayenne pepper (noun)	long pepper (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	slender tropical climber of the eastern Himalayas
plant bearing very hot and finely tapering long peppers; usually red