jalapeno vs cayenne pepper

jalapeno and cayenne pepper both are nouns.

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

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

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

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

jalapeno (noun)	cayenne pepper (noun)
hot green or red pepper of southwestern United States and Mexico	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