coking — Coking is the process of changing residual oil to low molecular weight gases, naphtha, and gas oils.
joking — something said or done to provoke laughter or cause amusement, as a witticism, a short and amusing anecdote, or a prankish act: He tells very funny jokes. She played a joke on him.
poking — to prod or push, especially with something narrow or pointed, as a finger, elbow, stick, etc.: to poke someone in the ribs.
smoking — the visible vapor and gases given off by a burning or smoldering substance, especially the gray, brown, or blackish mixture of gases and suspended carbon particles resulting from the combustion of wood, peat, coal, or other organic matter.
soaking — to lie in and become saturated or permeated with water or some other liquid.