def get_wordlist(language, word_source):
    """ Takes in a language and a word source and returns a matching wordlist,
        if it exists.
        Valid languages: ['english']
        Valid word sources: ['bip39', 'wiktionary', 'google']
    """
    try:
        wordlist_string = eval(language + '_words_' + word_source)
    except NameError:
        raise Exception("No wordlist could be found for the word source and language provided.")
    wordlist = wordlist_string.split(',')
    return wordlist