13-Letter Words Containing: _,G,I,K,O,R

• the process whereby hydrocarbon molecules of petroleum are broken down into kerosene and gasolene by the addition of hydrogen under high pressure in the presence of a catalyst

• the execution of low priority programs while higher priority programs are not using the processing system

• trespassing for an unlawful purpose; illegal entrance into premises with criminal intent

• the activity of making things out of metal in a skillful manner