Cases of word usage

1) the part of a ship where coal or fuel oil is stored (bunker)

2) the substance that remains when gas is being taken out of coal, used as a fuel (coke)

3) a type of heavy fuel used in special designed engines (diesel engines) in buses, trains, lorries etc (diesel)

4) partly decayed plant material, used as a fuel and fertilizer (peat)

5) refined petroleum, used as a fuel in vehicles, planes etc (petrol)

6) a mineral oil found underground, used as a fuel (petroleum)