Synonyms and Sameness

If A and B share the same essences, like "Being" and "Goodness" share the same essence, does that mean that the terms we use for A and B respectively are synonymous? This question was brought up to me in the context of a discussion had on the Trinity and Divine Simplicity. If all three persons of the Trinity share in the same essence, then the terms would be synonymous, which is absurd. Obviously The Father, The Son, and The Holy Spirit do not refer to the same person and are not interchangeable. 

But it doesn't follow that if something shares in the same essence that the terms must be synonymous, and this is illustrated when we think about the convertibility thesis, which is what my last few posts have been touching on. Though being and goodness are convertible and the same, they are not synonymous terms. They refer to the same thing, but differ in thought. “Good” expresses the idea of desirability, which the term “being” does not express. “Good” adds the relation to the appetite. Likewise, as Aquinas shows, the Trinity does refer to the number of persons related to each other. There are relational distinctions that the names Father, Son, and Holy Spirit confer, just like "Good" has a relational distinction to the appetite. The name Father, Son, and Holy Spirit all refer to the same God, but they refer to different relational properties, and for that reason, the names cannot be synonymous. 

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