chaos. phlogiston.
Both are equally valuable as scientific terms. In order for chaos to essentially rule, physical laws governing physical matter must cease to function. Until then, chaos, like the words supernatural and natural, are scientifically trite.
This concepts may be trite, but there are precise definitions, accepted by virtually everyone who discusses this terms. And until the physical laws cease to function, communication is so much easier if the terms are used in the usual way - unless stated otherwise!