Depends, there's three levels. Terra has Universal, which is 8 points per rank (granted, 1 rank is enough for communication, and if you want to just talk to people at long range, it's better to sink points into range after that). For 2 points per level you can get Minor class, which is narrow but can be "to all slimes" or such. 4 points per rank is major class, which is more like "all beasts" or "all humans". So it depends how many points you dropped on it.