'Prophet' in the Bible

The cry of the lion is sounding; who will not have fear? The Lord God has said the word; is it possible for the prophet to keep quiet?

Then Amaziah said to Amos, “Go, you seer, run for your life [from Israel] to the land of Judah [your own country] and eat bread and live as a prophet there!

But be a prophet no longer at Beth-el: for it is the holy place of the king, and the king's house.

Then answered Amos, and said to Amaziah, I was no prophet, neither was I a prophet's son; but I was an herdman, and a gatherer of sycomore fruit:

And the Lord took me from the flock, and the Lord said to me, Go, be a prophet to my people Israel.

Now then, give ear to the word of the Lord: You say, Be no prophet to Israel, and say not a word against the people of Isaac.