Capsicum frutescens vs capsicum

Capsicum frutescens and capsicum both are nouns.

Word	Noun	Adjective	Verb	Adverb
Capsicum frutescens	Yes	No	No	No
capsicum	Yes	No	No	No

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

Capsicum frutescens: plant bearing very hot medium-sized oblong red peppers; grown principally in the Gulf Coast states for production of hot sauce
capsicum: any of various tropical plants of the genus Capsicum bearing peppers

Other hypernyms of Capsicum frutescens include capsicum pepper plant, pepper.

Capsicum frutescens (noun)	capsicum (noun)
plant bearing very hot medium-sized oblong red peppers; grown principally in the Gulf Coast states for production of hot sauce	any of various tropical plants of the genus Capsicum bearing peppers