chili pepper vs long pepper

chili pepper and long pepper both are nouns.

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

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

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

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

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