Guinea pepper vs Guinea grains

Guinea pepper and Guinea grains both are nouns.

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

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

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

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

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