 this is by verbal association not by semantic association as the part of the bone that is exposed from it is called bone and the piece of meat is called meat and the nerve is called nerve and so on.
وذلك بالاشتراك اللفظي لا بالاشتراك المعنوي كما سمي جزء العظم وهو القطعة التي تعرض منه عظما، والقطعة من اللحم لحما، ومن العصب عصبا ونحو ذلك.