One thinks of melons as somewhere halfway between the two, but the distinction between them is surely that one does not consume the exterior of a pineapple - unless one is very stupid indeed! - whereas one would usually eat the skin of a peach.
Her tænker man på meloner som noget midt imellem de to, men forskellen mellem de to er bestemt, at man ikke konsumerer ydersiden af en ananas - medmindre man er virkelig tåbelig! - hvorimod man normalt spiser fersknens skind.