French, Mor/Hijz Arabic (heritage)
I think "buttermilk" is لبن مخيض in Palestinian. (There's also لبن رايب, but I'm not totally sure what that is.) سمنة is specifically "ghee," isn't it?
In Morocco, the word is masculine (سمن) and refers to "ghee" only. This usage crosses Egypt/Sudan then (without stopping).