A pesquisa no Google por um Word Glossary Template revelou este artigo interessante, longo e muito informativo sobre Como criar um glossário no Microsoft Word .
É muito longo para copiar e colar a coisa toda, mas o começo do artigo realmente soletra para você.
The simplest way to create a glossary is to type your glossary by hand at the end of your document. Word has no built-in method of creating a glossary automatically, but you can use hyperlinks or the Table of Authorities functionality to create a glossary for one or more documents.
Option 1: Create your glossary manually
This option is the simplest. Go to the end of your document, and type your glossary. You can use a table with or without borders, or you can put the term and its definition in separate paragraphs.
If you put the term and its definition in paragraphs one after the other, it is a good idea to define a style for the term (called, say, GlossaryTerm) and another for the definition (called, say, GlossaryDefinition). Set each one to be followed by the other, so that when you press Enter, Word automatically formats the next paragraph in the right style.