The term 'Custard Apple's Cousin' refers to two tropical fruits, Soursop (7 letters) and PAWPAW (6 letters). Soursop is a large, spiky green fruit with white flesh and a sweet-sour flavor. It is native to the Caribbean, Central America, and northern South America. PAWPAW is a yellow-green fruit with a creamy texture and a sweet flavor. It is native to the eastern United States and parts of Canada. Both fruits are related to the custard apple, which is native to the tropics of the Americas.