A famous Napoleon quote is sometimes written like this:
The word impossible is not in my dictionary.
Does 文字 actually mean "word" in this sentence? I thought it always means "character". Or is it used as a plural that refers to all three symbols? Would the "feel" of this quote change if I put 言葉 (or maybe even 単語) there instead? Are there other situations where I can replace these words with 文字?