negro pepper vs Guinea pepper

negro pepper and Guinea pepper both are nouns.

Word	Noun	Adjective	Verb	Adverb
negro pepper	Yes	No	No	No
Guinea pepper	Yes	No	No	No

As nouns, negro pepper and Guinea pepper are synonyms defined as:

negro pepper and Guinea pepper: tropical west African evergreen tree bearing pungent aromatic seeds used as a condiment and in folk medicine

Other synonyms of negro pepper include Xylopia aethiopica.

negro pepper (noun)	Guinea pepper (noun)
tropical west African evergreen tree bearing pungent aromatic seeds used as a condiment and in folk medicine	tropical west African evergreen tree bearing pungent aromatic seeds used as a condiment and in folk medicine
	West African plant bearing pungent peppery seeds