Catching up on my reading I came across this post - http://blogs.msdn.com/powershell/archive/2009/09/20/what-s-up-with-command-prefixes.aspx which is a good explanation for why we should use command prefixes when creating cmdlets. There is a reference to prefixes increasing the Hamming Distance of noun names.
Not knowing what a Hamming Distance is I followed the link to http://en.wikipedia.org/wiki/Hamming_distance and found that it is a measure of the difference between two strings i.e. how many substitutions are required to turn one string into another.
We can find the Hamming Distance as follows
Input a couple of strings, check they are the same length and then compare on a character by character basis.
The script can be used like this
PS> .\Get-HammingDistance.ps1 toned roses
Hamming Distance for toned and roses is 3
PS> .\Get-HammingDistance.ps1 baston boston
Hamming Distance for baston and boston is 1
PS> .\Get-HammingDistance.ps1 2173896 2233796
Hamming Distance for 2173896 and 2233796 is 3