An arsonist.
A stick with a flame on one end, used chiefly as a light source; a similarly shaped implement with a replaceable supply of flammable material.
A blowtorch or oxy-gas torch.
A portable light source powered by electricity; a flashlight.
A torch drive ("a spacecraft engine which produces thrust by nuclear fusion").
To set fire to, especially by use of a torch (flaming stick).
To travel in a spacecraft propelled by a torch drive ("a spacecraft engine which produces thrust by nuclear fusion").