grains of paradise vs Guinea pepper

grains of paradise and Guinea pepper both are nouns.

Word	Noun	Adjective	Verb	Adverb
grains of paradise	Yes	No	No	No
Guinea pepper	Yes	No	No	No

As nouns, grains of paradise and Guinea pepper are synonyms defined as:

grains of paradise and Guinea pepper: West African plant bearing pungent peppery seeds

Other synonyms of grains of paradise include Aframomum melegueta, Guinea grains, melagueta pepper.

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