Frontend\Modules\Search\Engine\Model::getSynonyms PHP Method

    public static function getSynonyms($term)
    {
        // query db for synonyms
        $synonyms = FrontendModel::getContainer()->get('database')->getVar('SELECT synonym
             FROM search_synonyms
             WHERE term = ?', array((string) $term));
        if (!$synonyms) {
            $synonyms = (array) FrontendModel::getContainer()->get('database')->getColumn('SELECT term FROM search_synonyms
                 WHERE synonym LIKE ? OR synonym LIKE ? OR synonym LIKE ? OR synonym = ?', array("{$term},%", "%,{$term}", "%,{$term},%", $term));
        } else {
            $synonyms = explode(',', $synonyms);
        }
        // found any? merge with original term
        if ($synonyms) {
            return array_unique(array_merge(array($term), $synonyms));
        }
        // only original term
        return array($term);
    }