| Rating | Solver | Clue |
|---|---|---|
| BORDER | Separating line | |
| HORIZON | The unbroken line separating sky and water, as seen by an eye at a given elevation, no land being visible. | |
| BOUNDARY | That which indicates or fixes a limit or extent, or marks a bound, as of a territory; a bounding or separating line; a real or imaginary limit. | |
| PARTITION | ...fferent things, or distinct parts of the same thing, are separated; separating boundary; dividing line or space; specifically, an interior wall ... |