[SRC c#]string[] names = { "Albert", "Burke", "Connor", "David",
                   "Everett", "Frank", "George", "Harris"};

// group by length
var groups = names.GroupBy(s => s.Length);

foreach (IGrouping<int, string> group in groups) {
    Console.WriteLine("Strings of length {0}", group.Key);

    foreach (string value in group)
        Console.WriteLine("  {0}", value);
}    

Strings of length 6
  Albert
  Connor
  George
  Harris
Strings of length 5
  Burke
  David
  Frank
Strings of length 7
  Everett

 group word by key

Key=  аворт 

автор 
втора 
отвар 
рвота 
тавро 
товар