Is it fine to call a Custom Taxonomy (created to store Custom Post Type) "Category" like it is already the case for normal Posts, and to use all the terminology ("Categories", "Create a new category", etc.) ? I mean, are there any risk of instability or compatibility issues if I do so ? Like for example : taxonomy overridden, etc…

  • 1
    Might not be what you're looking for but fwiw you can associate the default 'category' taxonomy with your new Custom Post Type - see the examples on this page that show how to associate 'category' with Pages as well as Posts, for example: developer.wordpress.org/reference/functions/…
    – Michelle
    Jun 9, 2020 at 19:16
  • Very useful, thanks ! I'm just wondering if the performance are the same. I mean, using an already registered taxonomy (category in this case) might have consequences with the queries, the database, etc., if I use this taxonomy for a big amount of posts.
    – PhpDoe
    Jun 10, 2020 at 7:38

1 Answer 1


No. "Category" is one of WordPress reserved terms.


Reserved terms

  • attachment_id
  • author
  • author_name
  • calendar
  • cat
  • category
  • category__and
  • category__in
  • category__not_in
  • Thanks for the link : it's exactly what i was looking for !
    – PhpDoe
    Jun 8, 2020 at 16:26
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    Note that there's nothing stopping you from using the word "Category" in the label(s) of the taxonomy; you just can't do, eg, register_taxonomy( 'category', $args ); . Be aware, though, that using "Category" in the label(s) may cause confusion to your users. I'd recommend using something like "{Post Type} Category" instead.
    – Pat J
    Jun 8, 2020 at 16:40

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