| 100% | COAL | 4 | Black fossil fuel that's burnt to generate heat |
| 62% | COAL | 4 | Black fossil fuel used to generate heat |
| 43% | COAL | 4 | Fossil fuel that contributes to global warming |
| 41% | COAL | 4 | Fossil fuel that's mined |
| 40% | COAL | 4 | Fossil fuel that's mostly carbon |
| 40% | PEAT | 4 | Fuel that's burned |
| 40% | COAL | 4 | Fossil fuel that's extracted from mines |
| 37% | COAL | 4 | Black lump that can be burned for heat or power |
| 36% | COAL | 4 | Black fossil fuel |
| 35% | FIRE | 4 | Heat source on a burning torch that you may use to fight a monster |
| 34% | COAL | 4 | Black fossil fuel for some locomotives |
| 34% | COAL | 4 | Fossil fuel that comes in lumps |
| 32% | PIPINGHOT | 9 | Food that's been heated to the point of sizzling |
| 32% | COAL | 4 | Fuel that comes in black lumps |
| 32% | COAL | 4 | Fuel that contributes to global warming |
| 31% | COAL | 4 | Fuel source that contributed to London’s Great Smog of 1952 |
| 31% | SCALDED | 7 | Like milk that's been heated to just under the boiling point |
| 31% | ORONO | 5 | City that’s home to Maine’s Black Bear Brewing Co. |
| 31% | OMAHA | 5 | City that’s home to the Great Plains Black History Museum |
| 31% | ORINOCO | 7 | River that's home to the black spot piranha |
| 31% | SAGE | 4 | Herb that's sometimes burned to "cleanse" a house |
| 31% | AMMONIA | 7 | Fuel that produces no carbon emission when burned |
| 30% | THAE | 4 | Those, to Robert Burns |
| 30% | ANTHRACITE | 10 | Hard jet-black coal that burns slowly giving out an intense heat |
| 29% | DIESEL | 6 | Liquid fuel that burns more slowly than gasoline |
| 29% | COAL | 4 | Black fuel burned in a furnace |
| 29% | COAL | 4 | Fuel that's shoveled |
| 28% | CHARCOAL | 8 | Black carbon from burnt wood used to draw |
| 28% | CHAMBERS | 8 | Combustion __; engine components that burn fuel |
| 28% | PEPPER | 6 | Capsicum that adds heat to dishes |