Plum is Prune

We had a little discussion about prune being dried plum.  I remember watching a show about some French farmer saying their prune are prune fruit.  So both of us are right.  There is a special prune plum for making prune.  As it turns out, all the plum is in subgenus of Prunus.  

Anyway, I don't eat either of them, whatever you call them.