The words you provided appear to be from different languages and contexts. Here's the explanation with the translations you asked for:

• "do" — English word meaning to perform or carry out an action.
• "und" — [und](javascript:void(0)) (German word meaning "and").
• "co" — English abbreviation for "company" or could be short for "company" in multiple languages.
• "stephansplatz" — [Stephansplatz](javascript:void(0)) (German, meaning "St. Stephen's Square," a famous central square in Vienna, Austria).

So, the foreign words in your list are [und](javascript:void(0)) and [Stephansplatz](javascript:void(0)).