cayenne pepper vs jalapeno

cayenne pepper and jalapeno both are nouns.

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

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

cayenne pepper and jalapeno: 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, long pepper.

cayenne pepper (noun)	jalapeno (noun)
ground pods and seeds of pungent red peppers of the genus Capsicum	hot green or red pepper of southwestern United States and Mexico
a long and often twisted hot red pepper	plant bearing very hot and finely tapering long peppers; usually red
plant bearing very hot and finely tapering long peppers; usually red