"Homoousia" is a Greek word that means "of the same substance". It has been used in theological contexts to denote the concept of the unity of the Holy Trinity. The term is often used in conjunction with the Nicene Creed, which states that Jesus Christ is "of one substance with the Father". There are several synonyms for "homoousia" that have been used throughout history. One of the most common is "consubstantial", which also means "of the same substance". Another synonym is "coessential", which means "having the same nature or essence". Other possible synonyms for "homoousia" include "coeternal", "coequal", and "congenital". All of these terms point to the fundamental unity of the Holy Trinity and the divine nature of Jesus Christ.