| Rating | Solver | Clue |
|---|---|---|
| VENT | Air aperture | |
| SPIRACLE | Any small aperture or vent for air or other fluid. | |
| BOLE | An aperture, with a wooden shutter, in the wall of a house, for giving, occasionally, air or light; also, a small closet. | |
| STOP | The closing of an aperture in the air passage, or pressure of the finger upon the string, of an instrument of music, so as to modify the tone; ... |