Good morning Jeanne77, thank you for your contribution. Plums are round, very juicy and have a smaller stone, generally very attached to the flesh. Plums are oval, smaller, firmer and have a stone that can be removed easily after halving the fruit. The generic term for both fruits is "plum." This is also well understood from the botanical name: Prunus domestica. All types of plums and plums are therefore part of the category "plums": Sincerely, Alex