The power to directly elect or remove the top spot is certainly an important facet of democracy, maybe even the most important, but it's still just one of many measures. to be honest I don't think it's really that meaningful to talk about one system being "more democratic" than another, or that "entirely democratic" can apply coherently to anything except some kind of anarchist utopia.

That said, there is such a thing as the global [democracy index](https://en.wikipedia.org/wiki/Democracy_Index) in which the US comes well below the UK and plenty of other EU countries. Note that Norway, also a constitutional and hereditary monarchy, tops the list.