This is the 4544th most frequent Russian word.
газом
The Russian word "газом" means "by gas" or "with gas" (instrumental case of "газ" - gas).
газом: instrumental case indicating the means by which something is done, in this case, refueling with gas as fuel.
Газом заправляют автомобиль.
The car is refueled with gas.
газом: instrumental case signifying the method or material used for lighting, specifically referring to gas used in lighting fixtures.
Комната освещена газом.
The room is lit with gas.
газом: usage here signifies the inclusion or functioning of the stove using gas as an energy source.