Zeth'kur was a town that existed before the shattering of Draenor. It then became the location of the orcish shipyards in Hellfire Peninsula during the Invasion of Draenor. The town, its shipyards and the warships stationed there were all destroyed by the Alliance Expedition forces that crossed into Draenor.
Zeth'Gor in The Burning Crusade bears a similar name and location; however, there is no evidence showing that they are the same location. Given the position of the village in Warlords of Draenor, it's more likely that Zeth'kur did not survive the land's destruction.