A ngogh has a more-or-less defined shape, but it doesn't matter whether it was shaped by someone or it just happened naturally. And the shape doesn't have to be perfect. A Sawqe' probably doesn't have a defined (or even easily describable) shape (though it may come close or sort of resemble one). Sawqe' is generally used for smaller objects, but there's no clear-cut dividing line about size, and there are certainly Sawqe'mey tIn and ngoghmey mach. Certain items tend to always be referred to by one or the other: Your house is probably built out of ngoghmey, and someone seeking gold would most likely find qol'om Sawqe'mey in the wild (though qol'om ngoghmey at Fort Knox). There are, of course, instances where two people might refer to the same thing, especially if they are of ambiguous shape, by different terms.