Let author to add categories but categories and tags are not accessible restricted by some keywords

code.php

<?php

// Adding capabilities in admin init
add_action( 'admin_init', 'add_author_cap' );
function add_author_cap() {
	// Get current user's role
	global $current_user;
	$user_roles = $current_user->roles;
	$user_role = array_shift($user_roles);
	if( $user_role == 'author' ) {
		// Removing the category and tag admin pages for authors
		remove_submenu_page( 'edit.php', 'edit-tags.php?taxonomy=category' );
		remove_submenu_page( 'edit.php', 'edit-tags.php?taxonomy=post_tag' );
	}
	// Adding capabilities for authors
	$role = get_role( 'author' );
	$role->add_cap( 'manage_categories' ); 
}

add_action( 'admin_footer', 'check_cat_keys' );
function check_cat_keys() {
	// Get role of the user
	global $current_user;
	$user_roles = $current_user->roles;
	$user_role = array_shift($user_roles);
	if( $user_role == 'author' ) {
		?>
		<script type="text/javascript">
			jQuery(function($){
				// This is the array of restricted keywords. Add as many as you want. Items in this array can't be added by the author
				var keywords = new Array( 'test', 'hey', 'bad' );
				$('#category-add-submit').click(function(e){
					var newCat = $('#newcategory').val();
					if(inArray(newCat, keywords)) {
						e.preventDefault();
						// Alert message for the author when he tries to add a restricted category keyword
						alert( 'You can\'t use this word as category name.' );
						return false;
					}else{
						return true;
					}
				});
				
				// Function for comparing two arrays
				function arrayCompare(a1, a2) {
					if (a1.length != a2.length) return false;
					var length = a2.length;
					for (var i = 0; i < length; i++) {
					    if (a1[i] !== a2[i]) return false;
					}
					return true;
				    }
				    
				    // Check if an element is available in an array
				    function inArray(needle, haystack) {
					var length = haystack.length;
					for(var i = 0; i < length; i++) {
					    if(typeof haystack[i] == 'object') {
						if(arrayCompare(haystack[i], needle)) return true;
					    } else {
						if(haystack[i] == needle) return true;
					    }
					}
					return false;
				    }
			});
		</script>
		<?php
	}
}