'Preacher' in the Bible

How then shall they call on him in whom they have not believed? and how shall they believe in him whom they have not heard? and how shall they hear without a preacher?

whereunto I was appointed a preacher and an apostle (I speak the truth, I lie not), a teacher of the Gentiles in faith and truth.

whereunto I was appointed a preacher, and an apostle, and a teacher.

and spared not the ancient world, but preserved Noah with seven others, a preacher of righteousness, when he brought a flood upon the world of the ungodly;