There were two major Latin words involved. The first is substantia, Although the word was idiomatically to mean “goods” or “property” and in a legal sense to denote “ that to which two or more parties could share legal claim,” there never was never much doubt as to what the Church Fathers intended when using substantia was simply the being of God. Thus to say , with the Latin orthodox theologians, that Father,Son, and Spirit were consubstantialis was to say that they shared the same basic “thing” or “what” that they were: namely, they were God.
Godhead, God, substance Essence and being all synonyms
The Athanasion Creed
Whosoever will be saved, before all things it is necessary that he hold the catholic faith. Which faith except every one do keep whole and undefiled; without doubt he shall perish everlastingly. And the catholic faith is this: That we worship one God in Trinity, and Trinity in Unity; Neither confounding the Persons; nor dividing the Essence. For there is one Person of the Father; another of the Son; and another of the Holy Ghost. But the Godhead of the Father, of the Son, and of the Holy Ghost, is all one; the Glory equal, the Majesty coeternal. Such as the Father is; such is the Son; and such is the Holy Ghost. The Father uncreated; the Son uncreated; and the Holy Ghost uncreated. The Father unlimited; the Son unlimited; and the Holy Ghost unlimited. The Father eternal; the Son eternal; and the Holy Ghost eternal. And yet they are not three eternals; but one eternal. As also there are not three uncreated; nor three infinites, but one uncreated; and one infinite. So likewise the Father is Almighty; the Son Almighty; and the Holy Ghost Almighty. And yet they are not three Almighties; but one Almighty. So the Father is God; the Son is God; and the Holy Ghost is God. And yet they are not three Gods; but one God.