diff --git a/wp-includes/class-wp-term-query.php b/wp-includes/class-wp-term-query.php
index b507a0f874..0f679535c3 100644
--- a/wp-includes/class-wp-term-query.php
+++ b/wp-includes/class-wp-term-query.php
@@ -285,12 +285,16 @@ class WP_Term_Query {
 	}
 
 	/**
-	 * Sets up the query for retrieving terms.
+	 * Sets up the query and retrieves the results.
+	 *
+	 * The return type varies depending on the value passed to `$args['fields']`. See
+	 * WP_Term_Query::get_terms() for details.
 	 *
 	 * @since 4.6.0
 	 *
 	 * @param string|array $query Array or URL query string of parameters.
-	 * @return array|int List of terms, or number of terms when 'count' is passed as a query var.
+	 * @return WP_Term[]|int[]|string[]|string Array of terms, or number of terms as numeric string
+	 *                                         when 'count' is passed as a query var.
 	 */
 	public function query( $query ) {
 		$this->query_vars = wp_parse_args( $query );
@@ -298,13 +302,43 @@ class WP_Term_Query {
 	}
 
 	/**
-	 * Get terms, based on query_vars.
+	 * Retrieves the query results.
+	 *
+	 * The return type varies depending on the value passed to `$args['fields']`.
+	 *
+	 * The following will result in an array of `WP_Term` objects being returned:
+	 *
+	 *   - 'all'
+	 *   - 'all_with_object_id'
+	 *
+	 * The following will result in a numeric string being returned:
+	 *
+	 *   - 'count'
+	 *
+	 * The following will result in an array of text strings being returned:
+	 *
+	 *   - 'id=>name'
+	 *   - 'id=>slug'
+	 *   - 'names'
+	 *   - 'slugs'
+	 *
+	 * The following will result in an array of numeric strings being returned:
+	 *
+	 *   - 'id=>parent'
+	 *
+	 * The following will result in an array of integers being returned:
+	 *
+	 *   - 'ids'
+	 *   - 'tt_ids'
+	 *
+	 * In all cases, a `WP_Error` object will be returned if an invalid taxonomy is used.
 	 *
 	 * @since 4.6.0
 	 *
 	 * @global wpdb $wpdb WordPress database abstraction object.
 	 *
-	 * @return array List of terms.
+	 * @return WP_Term[]|int[]|string[]|string Array of terms, or number of terms as numeric string
+	 *                                         when 'count' is passed as a query var.
 	 */
 	public function get_terms() {
 		global $wpdb;
diff --git a/wp-includes/taxonomy.php b/wp-includes/taxonomy.php
index 70f5d3bca8..5055b612c6 100644
--- a/wp-includes/taxonomy.php
+++ b/wp-includes/taxonomy.php
@@ -1131,11 +1131,15 @@ function get_term_to_edit( $id, $taxonomy ) {
 }
 
 /**
- * Retrieve the terms in a given taxonomy or list of taxonomies.
+ * Retrieves the terms in a given taxonomy or list of taxonomies.
  *
  * You can fully inject any customizations to the query before it is sent, as
  * well as control the output with a filter.
  *
+ * The return type varies depending on the value passed to `$args['fields']`. See
+ * WP_Term_Query::get_terms() for details. In all cases, a `WP_Error` object will
+ * be returned if an invalid taxonomy is requested.
+ *
  * The {@see 'get_terms'} filter will be called when the cache has the term and will
  * pass the found term along with the array of $taxonomies and array of $args.
  * This filter is also called before the array of terms is passed and will pass
@@ -1177,8 +1181,9 @@ function get_term_to_edit( $id, $taxonomy ) {
  *                                 If present, this parameter will be interpreted as `$args`, and the first
  *                                 function parameter will be parsed as a taxonomy or array of taxonomies.
  *                                 Default empty.
- * @return WP_Term[]|int|WP_Error Array of WP_Term instances, a count thereof,
- *                                or WP_Error if any of the taxonomies do not exist.
+ * @return WP_Term[]|int[]|string[]|string|WP_Error Array of terms, a count thereof as a numeric string,
+ *                                                  or WP_Error if any of the taxonomies do not exist.
+ *                                                  See the function description for more information.
  */
 function get_terms( $args = array(), $deprecated = '' ) {
 	$term_query = new WP_Term_Query();
@@ -1745,7 +1750,8 @@ function sanitize_term_field( $field, $value, $term_id, $taxonomy, $context ) {
  *                                 If present, this parameter will be interpreted as `$args`, and the first
  *                                 function parameter will be parsed as a taxonomy or array of taxonomies.
  *                                 Default empty.
- * @return array|int|WP_Error Number of terms in that taxonomy or WP_Error if the taxonomy does not exist.
+ * @return string|WP_Error Numeric string containing the number of terms in that
+ *                         taxonomy or WP_Error if the taxonomy does not exist.
  */
 function wp_count_terms( $args = array(), $deprecated = '' ) {
 	$use_legacy_args = false;
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 596f243860..1888a2aaa4 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.7-alpha-49946';
+$wp_version = '5.7-alpha-49947';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.