pimento vs capsicum

pimento and capsicum both are nouns.

Word	Noun	Adjective	Verb	Adverb
pimento	Yes	No	No	No
capsicum	Yes	No	No	No

As nouns, capsicum is a hypernym of pimento; that is, capsicum is a word with a broader meaning than pimento:

pimento: plant bearing large mild thick-walled usually bell-shaped fruits; the principal salad peppers
capsicum: any of various tropical plants of the genus Capsicum bearing peppers

Other hypernyms of pimento include capsicum pepper plant, pepper.

pimento (noun)	capsicum (noun)
fully ripened sweet red pepper; usually cooked	any of various tropical plants of the genus Capsicum bearing peppers
plant bearing large mild thick-walled usually bell-shaped fruits; the principal salad peppers