Bower of bliss is a phrase that is often used in literature to describe a place of ultimate happiness and serenity. However, there are several other synonyms that can be used to express the same meaning of this phrase. Such synonyms include "haven of happiness," "sanctuary of contentment," "oasis of delight," "paradise of joy," and "retreat of tranquility." These synonyms highlight the emotional and mental state of being in a place of complete bliss and happiness, where one can escape from the troubles of the world and feel a deep sense of peace and serenity. So, whichever synonym is used, they all convey the same idea of being in a haven of happiness where one can find true bliss.