capsicum vs capsicum pepper plant

capsicum and capsicum pepper plant both are nouns.

Word	Noun	Adjective	Verb	Adverb
capsicum	Yes	No	No	No
capsicum pepper plant	Yes	No	No	No

As nouns, capsicum and capsicum pepper plant are synonyms defined as:

capsicum and capsicum pepper plant: any of various tropical plants of the genus Capsicum bearing peppers

Other synonyms of capsicum include pepper.

capsicum (noun)	capsicum pepper plant (noun)
any of various tropical plants of the genus Capsicum bearing peppers	any of various tropical plants of the genus Capsicum bearing peppers