Yogis are referred to as Babajis or Swamijis? What is the difference between these titles?

If there is a small child in your home, don’t you call her with different names like Sweetie, Dolly etc? You are giving all these names out of love for the child. Similarly people address Yogis with different names like Babaji or Swamiji etc. Apart from that there is no difference. However each will have his or her own style of functioning.