chile vs chili pepper

chile and chili pepper both are nouns.

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

As nouns, chile and chili pepper are synonyms defined as:

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

Other synonyms of chile include chili, chilli, chilly.

chile (noun)	chili pepper (noun)
very hot and finely tapering pepper of special pungency	very hot and finely tapering pepper of special pungency
	plant bearing very hot and finely tapering long peppers; usually red