The crossword solution for the term 'Herb or Guru' is SAGE, which is a four-letter word. SAGE is an aromatic plant that is used in cooking and medicine, as well as a wise and respected teacher or mentor. It is derived from the Latin word salvia, which means 'to heal'. In many cultures, SAGE is believed to have spiritual and medicinal properties. In Hinduism, a guru is a spiritual teacher who guides and instructs their students on the path to enlightenment.