ost ~ fortress
garth ~ fortress
Ost Forod: Forod meaning North. Fortress of the North.
Ost Guruth: Guruth meaning death. Fortress of Death.
Garth Agarwen: Agar meaning blood and (g)wenn meaning maiden. Fortress of the blood-maiden
Ost Brandras: Brand meaning lofty or high, Ras meaning horn (either of animals or applied to mountains). Fortress of the High Horn.
There are many Osts scattered throughout middle earth, so I will intersperse these posts with some other types of constructed buildings or other translations. They are also quite difficult to screenshot, given their size so apologies if some of the screenshots are not very good.