Alternative Dictionaries

Apart from traditional dictionaries where you look up a word based on its spelling (e.g. dictionary.com) there are websites that provide alternative ways to find words:

• Reverse Dictionary - describe the concept to get the word. Checkout the matches for "computer programmer"
  
• Visual Dictionary - click on the images that describe the category, etc, drill down to the word
• Abbreviation and Acronyms Dictionary - checkout the matches for CEP