chili pepper vs Capsicum annuum longum

chili pepper and Capsicum annuum longum both are nouns.

Word	Noun	Adjective	Verb	Adverb
chili pepper	Yes	No	No	No
Capsicum annuum longum	Yes	No	No	No

As nouns, chili pepper and Capsicum annuum longum are synonyms defined as:

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

Other synonyms of chili pepper include cayenne, cayenne pepper, chilli pepper, jalapeno, long pepper.

chili pepper (noun)	Capsicum annuum longum (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