I have benchmarked your method. If i am not mistaken, is's another example of bidirectional search, isn't it?

Benchmark results:

             Rate  find_path       solo find_path2  transform
find_path  5.91/s         --       -62%       -75%       -97%
solo       15.7/s       166%         --       -35%       -92%
find_path2 24.1/s       308%        53%         --       -87%
transform   188/s      3084%      1097%       681%         --

[download]
Note: Your solution seems to be suitable only for basic English charset: 
  for my $letter ( 'a'..'z' ) {

[download]
And what about the Unicode? ;)

In reply to Re^2: A Better Word Morph Builder by Ieronim
in thread A Better Word Morph Builder by Limbic~Region

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