pimiento vs sweet pepper plant

pimiento and sweet pepper plant both are nouns.

Word	Noun	Adjective	Verb	Adverb
pimiento	Yes	No	No	No
sweet pepper plant	Yes	No	No	No

As nouns, pimiento and sweet pepper plant are synonyms defined as:

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

Other synonyms of pimiento include bell pepper, Capsicum annuum grossum, paprika, pimento, sweet pepper.

pimiento (noun)	sweet pepper plant (noun)
fully ripened sweet red pepper; usually cooked	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