Really? I didn't know. When I heard of God being mentioned in the OT I've heard of Elohim and Yahweh (which is God's name right?). I've never heard of the word Eloah before.
Here are some of the other Hebrew words used in the Old Testament, for the One True God of the Bible. 1. 'el; 2. 'elah; 3. 'eloah; 4. 'elohim; 5. 'el shadday (God Almighty); etc, etc. Then we have the Name of God, as given to Moses in Exodus chapter 3, which in its original form, was the four Hebrew consonants, YHWH, known as the Tetragrammaton. This Name was considered as far to sacred for the Jews to use, so they added vowels to it, thereby giving us "Yahweh". This Majestic Name of Almighty God, has its Hebrew root, in what The Angel of the Lord, Who is the Lord Jesus Christ, in His converestion with Moses in Exodus chapter 3, said, "’Ehyeh ’ăsher ’ehyeh", which is commonly (and rightly) translated as "I am Who I am". The Greek Old Testament, which was made some 150 years before the Birth of Jesus, by first-rate Hebrew scholars, have translated the Hebrew as, "ἐγώ εἰμι ὁ ὤν", which literally is, "I am the Eternal, Self-Existing One". This is exactly what the Name YAHWEH means. In many places in the OT, the Jews replaced Yahweh, with 'Adonay (also, Lord). So, for example, in Psalm 110:1, "The Lord said to my Lord...". The Hebrew has it, "Yahweh said to 'Adonay". Interestingly, there is a Hebrew manuscript that reads, "Yahweh said to Yahweh". Two Persons Who are called YAHWEH. In fact, in verse 5 of this Psalm, where we read, "The Lord at thy right hand shall strike through kings in the day of his wrath", where in later Hebrew manuscripts, "Lord" is 'Adonay. However, the older and better Hebrew manuscripts, it read, "Yahweh". This "Lord" is the same 'Adonay of verse one, Who is clearly known as YAHWEH (the Lord Jesus Christ), which was corrupted by the Jews, to try to remove the Deity of Jesus! In Genesis 19:24, we have a very interesting reading. In Chapter 18, one of the three men who appeared to Abraham, was none other than Yahweh, where the KJV Bible renders it, "LORD". In this verse in chapter 19, both uses of "Lord", then One on earth, Jesus Christ, and the Other in heaven, in the Hebrew, is YAHWEH!