jalapeno vs chilli pepper

jalapeno and chilli pepper both are nouns.

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

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

jalapeno and chilli 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, long pepper.

jalapeno (noun)	chilli 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