Mats Westholm

Add one or more Custom Taxonomy to your wordpress managed website.
This plugin is focused on an easy to use interface with small number of choices to make it easier to use for a non technical user.
MW Taxonomy let you choose
<ol>
<li>Taxonomy name in plural and singular,</li>
<li>slug</li>
<li>select the post types (default and custom) where your custom taxonomy can be used</li>
<li>select wheather it should be hierarchical or not</li>
<li>select wherher the taxonomy should be indexed by search engins or not</li>
</ol>
MW Taxonomy includes a widget Custom Taxonomy List for presenting taxonomies in the blog. You need to use a theme that supports widgets for this, that is a classic (non-block) theme. Use the plugin <a href="https://wordpress.org/plugins/classic-widgets/" rel="ugc">Classic Widgets</a> if you don’t find the widget.
Taxonomies can also be presented by Tag Cloud widget or menus (classic theme).
Works in multisite environment as well.
<h4>Docs & Support</h4>
Please ask support questions in the plugin [support forum].(https://wordpress.org/support/plugin/mw-taxonomy)

MW Taxonomy

Easy to use wordpress plugin to add a custom taxonomy

Pau Iglesias

The process to creating a post is not just writing, most of the time you need categorize, assign tags, etc.
But how are you sure of the quality of assignments? Too many categories? Missing tags in some posts?
This plugin allows you to detect these entries defining operations related to the number of terms.
Also have full support for custom post types and custom taxonomies.

Entries By Terms Count

The process to creating a post is not just writing, most of the time you need categorize, assign tags, etc.

MW Taxonomy vs Entries By Terms Count