pdalex

This plugin creates a glossary for your WordPress powered site. 
It will create an additional section in the admin panel, where you can add new terms to your glossary
A few notes about the sections above:
<ul>
<li>“Browse glossary” here you will see all terms.</li>
<li>“Add term” here you will add new term.</li>
</ul>

PdAlex Glossary

This plugin creates a glossary for your WordPress powered site.

Ignacio Cruz Moreno

Append or Prepend Content allows you to append or prepend content and blocks to any post type on your site.

Append or Prepend Content

Add content before or after every post, page or Custom Post Type.

PdAlex Glossary vs Append or Prepend Content