WordCounter is a simple tool that writers can use to identify the words that they use most frequently in their text. To use WordCounter simply copy and paste text into Wordcounter then select how many words should appear in your “frequently used” list. To improve the utility of your “frequently used words” list you can tell Wordcounter to ignore small words (like it or the) and to use only root words.

Applications for Education
WordCounter could be useful for student writers who fall into the trap of starting all of their sentences or paragraphs with the same word stucture.

Google Docs has a similar function that you can read about here.