There are several synonyms that can be used to describe the concept of "passage to nirvana." One such word is enlightenment, which refers to the attainment of profound knowledge and understanding of the true nature of existence. Another synonym is awakening, which describes the moment when an individual becomes aware of their own true nature and the nature of reality. Liberation is yet another term that is often used to describe this concept, as it signifies freedom from the cycle of birth and death and the attainment of true spiritual freedom. Ultimately, regardless of the word used, "passage to nirvana" refers to a state of consciousness that is marked by deep insight, peace, and profound joy.