Atbash: d ↔ w a ↔ z n ↔ m l ↔ o w ↔ d d ↔ w → "wzmodw"? Hmm. Wait, let's do it properly:
But "fylm" → f(6)→u(21), y(25)→b(2), l(12)→o(15), m(13)→n(14) → "ubon" (no).
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Z Y X W V U T S R Q P O N M L K J I H G F E D C B A