| Sg. Indef. | oknagras |
| Sg. Def. | oknagrasið |
| Pl. Indef. | oknagrøs |
| Pl. Def. | oknagrøsini |
| Sg. Indef. | oknagras |
| Sg. Def. | oknagrasins |
| Pl. Indef. | oknagrasa |
| Pl. Def. | oknagrasanna |
| Sg. Indef. | oknagrasi |
| Sg. Def. | oknagrasinum |
| Pl. Indef. | oknagrøsum |
| Pl. Def. | oknagrøsunum |
| Sg. Indef. | oknagras |
| Sg. Def. | oknagrasið |
| Pl. Indef. | oknagrøs |
| Pl. Def. | oknagrøsini |