There are several synonyms that can be used for the expression "living dream world". These words are often used to describe a state of mind in which the individual is living in a state of bliss and happiness, as if in a dream-like world. One synonym is "utopia", which refers to an imaginary place where everything is perfect. Another word that can be used is "paradise", which suggests a place of bliss and joy. Other synonyms include "fantasy land", "heavenly realm", "euphoria", and "world of enchantment". These words can be used to describe a state of mind or a physical place that is idealized and perfect in every way.