Wordpress: Disable Tags only for Posts
As of WordPress 3.7, there is an unregister_taxonomy_for_object_type function available for just this sort of thing.
In your case:
// Remove tags support from postsfunction myprefix_unregister_tags() { unregister_taxonomy_for_object_type('post_tag', 'post');}add_action('init', 'myprefix_unregister_tags');View the documentation for this function here.
Paste this code into your functions.php
add_action( 'admin_menu', 'myprefix_remove_meta_box');function myprefix_remove_meta_box(){ remove_meta_box( 'tagsdiv-post_tag','post','normal' );}tags meta box has a class of tagsdiv-post_tag, so this will remove the tags meta box
OR
add_action('init', 'remove_tags');function remove_tags(){ register_taxonomy('post_tag', array());}if you completely want to remove it