add_category_form_pre
Action Hook (deprecated): Fires before the Add Category form.
Source: wp-admin/edit-tags.php:387
add_link_category_form_pre
Action Hook (deprecated): Fires before the link category form.
Source: wp-admin/edit-tags.php:397
add_tag_form_pre
Action Hook (deprecated): Fires before the Add Tag form.
Source: wp-admin/edit-tags.php:407
{$taxonomy}_pre_add_form
Action Hook: Fires before the Add Term form for all taxonomies.
Source: wp-admin/edit-tags.php:424