| Rating | Solver | Clue |
|---|---|---|
| SLAG | Waste material | |
| RUBBISH | Waste material | |
| DROSS | Slag, waste material | |
| RADIO ACTIVE | Nuclear waste, ... material | |
| RADIOACTIVE | Nuclear waste, ... material | |
| RECYCLE | Convert waste into reusable material | |
| INSULITE | An insulating material, usually some variety of compressed cellulose, made of sawdust, paper pulp, cotton waste, etc. | |