jalapeno vs long pepper

jalapeno and long pepper both are nouns.

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

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

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

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

jalapeno (noun)	long pepper (noun)
hot green or red pepper of southwestern United States and Mexico	plant bearing very hot and finely tapering long peppers; usually red
plant bearing very hot and finely tapering long peppers; usually red	slender tropical climber of the eastern Himalayas