| Singular | Plural | |
|---|---|---|
| Nominativ | planities, planicies | planities, planicies |
| Genitiv | planitie, planitiei | planitierum |
| Dativ | planitii, planitie, planitiei | planitiebus |
| Akkusativ | planiciem, planitiem, planitiemque | planities, planicies |
| Ablativ | planitie | planitiebus |
| Vokativ | planities, planicies | planities, planicies |