| Answer | Crossword Clue |
|---|---|
| synfuel | a fuel derived from fossil fuels |
| synfuels | SYNFUEL, a fuel derived from fossil fuels |
| synfuel | a liquid or gaseous fuel derived especially from a fossil fuel that is a solid (as coal) or part of a solid (as tar sand or oil shale) |
| biofuel | a fuel (as wood or ethanol) composed of or produced from biological raw materials compare fossil fuel |
| astatki | a fuel derived from petroleum |
| astatkis | ASTATKI, a fuel derived from petroleum |
| biofuels | A fuel derived directly from living matter |
