Gloria Patri is a Latin hymn that has been used in Christian liturgy for centuries. While the phrase itself is not necessarily synonymous with anything, there are several words and phrases that could be used in place of it depending on the context. For example, the phrase "Praise the Lord" could be seen as a synonym for "Gloria Patri", as both are expressions of adoration and reverence towards God. Other synonyms could include "Blessed be God", "Hosanna in the highest", or "Holy, Holy, Holy". Ultimately, the best synonym for "Gloria Patri" would depend on the specific liturgical tradition in question and the intended tone or mood of the liturgy itself.