I've chosen "whisper" as a medium difficulty word for Hangman. At 7 letters, it falls within the allowed length. It contains the uncommon letter 'w' and the letter combination 'ph', which makes it moderately challenging to guess. The word is a common English verb/noun that most people know, but not among the first words players typically guess. It follows all the rules: contains only English letters, is a real word (not a proper noun or acronym), and has no spaces or special characters.