A guru is a realized teacher who can guide sincere aspirants. The term derives from the Sanskrit root gru, meaning heavy or weighty. Another reading takes gu as darkness and ru as remover: the guru as a dispeller of darkness.
Within the International Nath Order the founding guru is Shri Gurudev Mahendranath. In 1989 he appointed Sri Kapilnath Imperator Magus Mundi. A Guide is not, by that work, the guru of the old sadhu sampradayas. An Initiator is a Nath or Devi holding a MAGIKOS charter to initiate; that charter authorizes initiation, not a second Order. How initiation is asked for is on those pages. This entry does not repeat them.