WordNet sense 1 (offensive terms for a person of Italian descent):

greaseball, ginzo

WordNet sense 2 (a republic in western Africa on the Atlantic; formerly a French colony; achieved independence from France in 1958):

French Guinea, Republic of Guinea

WordNet sense 3 (a west African bird having dark plumage mottled with white; native to Africa but raised for food in many parts of the world):

guinea fowl, Numida meleagris