chilli pepper vs jalapeno

chilli pepper and jalapeno both are nouns.

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

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

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

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

chilli pepper (noun)	jalapeno (noun)
plant bearing very hot and finely tapering long peppers; usually red	hot green or red pepper of southwestern United States and Mexico
	plant bearing very hot and finely tapering long peppers; usually red