Little Hawk, Mr. Webster was reputed to be an anglophobe, so maybe he left some words out out of malice, and/or to drive a wedge between Canada and England. Heh heh.
I keep advocating this, but it seems that few listen. Download the free Wordweb dictionary! It sits on the toolbar, and is pretty comprehensive. Highlight word and click Wordweb. Easy. It says; Conflate: to mix together elements.