long pepper vs chili pepper

long pepper and chili pepper both are nouns.

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

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

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

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

long pepper (noun)	chili pepper (noun)
plant bearing very hot and finely tapering long peppers; usually red	very hot and finely tapering pepper of special pungency
slender tropical climber of the eastern Himalayas	plant bearing very hot and finely tapering long peppers; usually red