This action is documented in wp-includes/taxonomy.php
wp_update_term_data
Filters term data before it is updated in the database.
wp_update_term_parent
Filters the term parent.
wp_update_term
Update term based on arguments provided.
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wp_unique_term_slug
Filters the unique term slug.
wp_unique_term_slug_is_bad_slug
Filters whether the proposed unique term slug is bad.
wp_unique_term_slug
Will make slug unique, if it isn’t already.
deleted_term_relationships
Fires immediately after an object-term relationship is deleted.
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delete_term_relationships
Fires immediately before an object-term relationship is deleted.
wp_remove_object_terms
Remove term(s) associated with a given object.
wp_add_object_terms
Add term(s) associated with a given object.
set_object_terms
Fires after an object’s terms have been set.
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added_term_relationship
Fires immediately after an object-term relationship is added.
add_term_relationship
Fires immediately before an object-term relationship is added.
wp_set_object_terms
Create Term and Taxonomy Relationships.