Board Thread:Suggestions forum/@comment-222.153.46.128-20170615094717/@comment-25101089-20170618134908

As far as I know, the mutations apply (or don't apply) regardless of whether the second element is connected, or not. Meanwhile 'Orocarni', Orod + pl. carnë, 'Mountain Reds', in Sindarin would be something like: Orod + pl. Caran -> Orod Cerain -> Orod Gerain - > Orogerain? Alternatively, if the pluralisation is seen as applying to the whole form Orocarnë, 'Mountain Red', which probably makes more sense, then it would be pl. 'Orod Garan' -> Eregerain.
 * Eryn + Morn -> Eryn Vorn.
 * But Ered + Mithrin -/-> Ered Vithrin.
 * Thind + col -> Thind + gol -> Thingol.
 * Cir + tan -> Cir + dan -> Cirdan.
 * But Minas + Tirith -/-> Minas Dirith.
 * And Mor + dor -/-> Mordhor.