melagueta pepper vs Guinea grains

melagueta pepper and Guinea grains both are nouns.

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

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

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

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

melagueta pepper (noun)	Guinea grains (noun)
West African plant bearing pungent peppery seeds	West African plant bearing pungent peppery seeds