Glossary view: Show all results separated by letter
Check out the Glossary module.


  The glossary module scans posts for glossary terms (including
  synonyms). The glossary indicator is inserted after every found term,
  or the term itself is turned into an indicator depending on the site
  settings. By hovering over the indicator, users may learn the
  definition of that term. Clicking the indicator leads the user to that
  term presented within the whole glossary or directly to the detailed
  description of the term, if available.


or

Lexicon


  A lexicon is a stock of terms used in a particular profession, subject
  or style; a vocabulary. The Lexicon module generates one or more
  Lexicon pages based on terms in taxonomies and optionally marks terms
  in the content and links them to the appropriate Lexicon page.


or

take a look at G2 Glossary module.