Restrict submitters from wp-admin [duplicate]

This is possible, drop this code into your theme’s functions.php file:

add_action( 'init', 'wpse_244614_no_dashboard_for_subscriber' );
function wpse_244614_no_dashboard_for_subscriber() {

    $to = 'https://google.com/';

    $is_subscriber = current_user_can( 'subscriber' );
    $in_backend    = is_admin();
    $doing_ajax    = defined( 'DOING_AJAX' ) && DOING_AJAX;

    if ( $is_subscriber && $in_backend && ! $doing_ajax ) {
        wp_redirect( $to );
        exit;
    }
}

Now whenever a subscriber tries to reach the backend, he will be redirected to Google, you can use the website homepage home_url() or whatever you want.