sweet pepper vs Capsicum annuum grossum

sweet pepper and Capsicum annuum grossum both are nouns.

Word	Noun	Adjective	Verb	Adverb
sweet pepper	Yes	No	No	No
Capsicum annuum grossum	Yes	No	No	No

As nouns, sweet pepper and Capsicum annuum grossum are synonyms defined as:

sweet pepper and Capsicum annuum grossum: plant bearing large mild thick-walled usually bell-shaped fruits; the principal salad peppers

Other synonyms of sweet pepper include bell pepper, paprika, pimento, pimiento, sweet pepper plant.

sweet pepper (noun)	Capsicum annuum grossum (noun)
large mild crisp thick-walled capsicum peppers usually bell-shaped or somewhat oblong; commonly used in salads	plant bearing large mild thick-walled usually bell-shaped fruits; the principal salad peppers
plant bearing large mild thick-walled usually bell-shaped fruits; the principal salad peppers