WordNet sense 1 (tropical American tree having wood like mahogany and sweet edible egg-shaped fruit; in some classifications placed in the genus Calocarpum):

sapote, marmalade tree, Calocarpum zapota, Pouteria zapota

WordNet sense 2 (tropical American tree having edible fruit with a leathery rind):

mamey, mammee apple, Mammea americana, mammee tree

WordNet sense 3 (brown oval fruit flesh makes excellent sherbet):

marmalade plum