taxonomy_suggestions.info.yml

core: 8.x
type: module
name: Taxonomy Suggestions
description: 'Provides extra theme template suggestions for display modes of taxonomy terms'
version: 1.0

taxonomy_suggestions.module

<?php
/**
 * Implements hook_theme_suggestions_HOOK_alter().
 */
function taxonomy_suggestions_theme_suggestions_taxonomy_term_alter(array &$suggestions, array $variables)
{
    $term = $variables['elements']['#taxonomy_term'];
    $view_mode = $variables['elements']['#view_mode'];

    $suggestions[] = 'taxonomy_term__' . $term->bundle() . '__' . $view_mode;
    $suggestions[] = 'taxonomy_term__' . $view_mode;

}