Synonyms for Guinea Pepper (same or very similar meaning)
WordNet sense 1 (West African plant bearing pungent peppery seeds):
grains of paradise, Aframomum melegueta, Guinea grains, melagueta pepperWordNet sense 2 (tropical west African evergreen tree bearing pungent aromatic seeds used as a condiment and in folk medicine):
negro pepper, Xylopia aethiopicaFrom the ODE community, based on WordNetadd/edit