jalapeno pepper vs chili

jalapeno pepper and chili both are nouns.

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

As nouns, chili is a hypernym of jalapeno pepper; that is, chili is a word with a broader meaning than jalapeno pepper:

jalapeno pepper: hot green or red pepper of southwestern United States and Mexico
chili: very hot and finely tapering pepper of special pungency

Other hypernyms of jalapeno pepper include chile, chili pepper, chilli, chilly.

jalapeno pepper (noun)	chili (noun)
hot green or red pepper of southwestern United States and Mexico	very hot and finely tapering pepper of special pungency
	ground beef and chili peppers or chili powder often with tomatoes and kidney beans