hot pepper vs chili

hot pepper and chili both are nouns.

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

As nouns, chili is a hyponym of hot pepper; that is, chili is a word with a more specific, narrower meaning than hot pepper:

Other hyponyms of hot pepper include chile, chili pepper, chilli, chilly, red pepper, tabasco.

hot pepper (noun)	chili (noun)
any of various pungent capsicum fruits	very hot and finely tapering pepper of special pungency
plant bearing very hot medium-sized oblong red peppers; grown principally in the Gulf Coast states for production of hot sauce	ground beef and chili peppers or chili powder often with tomatoes and kidney beans