Great work, the glossary is great but is kinda mistaken.
Volante is the position in midfield with the task of taking the ball from any teammates and move in to the front. They can play in a holding position (usually when they do, they're called "regista" like Pirlo or Xabi Alonso) but they can also play more offensive, for example Gerrard can be considered a volante but he didn't play in a holding position.
Still, great job. Keep it up.