The Kula Moolavatara Kalpa Sutra Teeka Gata Kulagama mentions six classes of Gurus in regular gradation. They are;
Preraka One who just starts the pupil Suchaka One who indicates and carries further Vachaka One who regularly teaches and coaches Darscaka One who points out the way and goal to the pupil. Sikshaka One who regularly teaches [...]