I noticed a similar question here, but it seems nothing has been done... On superuser there are tags for virtualmachine and virtual-machine. I think these two at the least should be merged, if not also merge virtualization with it. I mean first of all, virtualization is not a word haha... and second, it doesn't make sense to have two or three tags for the same thing. Redundant and inefficient. Please merge them.
I have done the following merges. I used the latter since it is the most commonly used.
virtual-machine --> vitualmachine
vm --> virtualmachine
However I am not merging virtualization since it has a different meaning to virtualmachine.