rot13: replace a letter with the letter 13 positions further in the alphabet. Words that rot13 to other words According to the unix "words" dictionary on my system. Some names included, too. Abba -> noon abjurer -> nowhere ah -> nu ant -> nag balk -> onyx bar -> one be -> or clerk -> Pyrex crag -> pent ebbs -> roof eng -> rat envy -> rail errs -> reef faber -> snore fur -> she gel -> try gnat -> tang green -> terra ink -> Vax irk -> vex Junes -> wharf Jura -> when Words that rot13 into their reverse Words that are reversed when rot13 is applied. Tang/gnat is the only combination with actual meaning both ways. an -> na fans -> snaf gnat -> tang ravine -> enivar re -> er robe -> ebor serf -> fres thug -> guht (Back.)