An AutoCAD DWG is called a drawing. An AutoCAD Data eXchange File is called a DXF as in dee-ex-eff (If you get my phonetical drift?). A Design Web Format file is called a dee-double-you-eff. There was a brief moment in time, when we were calling them dwiffs, but that time has passed. The cognoscenti now all say DWF.
If you really think about it, DWF is more like DXF than printing formats like Tiff, HPGL, JPEG, or PDF. The metadata in a DWF that accompanies the geometry makes it an exchange format. The exchange format just happens to be print-ready compared to the original design data such as a DWG.
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