Only God, is a title that states that God is the single unrivaled divine being in the universe.
Only God in Greek:
Strong’s Concordance numbers: 3441, 2316
Bible reference: 1 Tim. 1:17
“Only God” is also a better reading of John 1:18.
Now to the King eternal, immortal, invisible, the only God, be honor and glory for ever and ever. Amen. (1 Tim. 1:17 NIV)
The KJV has “only wise God” here, but the word “wise” does not appear in the Greek text, it might have been borrowed from Romans 16:27, where “only wise God” does appear.
There are other names for God that emphasize that He alone is God. The Old Testament states that He is One God and One Lord.