I agree with David's answer, but would like to add some more information.
Yes, "This is not the "same word repeated and used in different way". As a matter of fact, both are not words at all, but two letters. And those letters are the "FIRST", and the "LAST". For as the answer states, it is found in Genesis 1:1, it is the "Aleph" and the "Tav". That is, the "First" and the "Last", or the Beginning and the End.
When read left to right, this is referring to two beings, the Son, "End", and the "Father", "Beginning". This Aleph and Tav is represented by two symbols, a person with their hands raised. Both symbols refer to the two MEN/beings WITH THEIR HANDS RAISED UP. This is the Echad of God, who is "Lord", Tav, and "God", Aleph. There are more to these two words that meets the eyes, or here, in Scriptures.
Source: Ancient Hebrew Lexicon of the Bible.