chili vs chilli

chili and chilli both are nouns.

Word	Noun	Adjective	Verb	Adverb
chili	Yes	No	No	No
chilli	Yes	No	No	No

As nouns, chili and chilli are synonyms defined as:

chili and chilli: very hot and finely tapering pepper of special pungency

Other synonyms of chili include chile, chili pepper, chilly.

chili (noun)	chilli (noun)
very hot and finely tapering pepper of special pungency	very hot and finely tapering pepper of special pungency
ground beef and chili peppers or chili powder often with tomatoes and kidney beans