'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?

And Amaziah said to Amos, O seer, go in flight into the land of Judah, and there get your living by working as a prophet:

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

Then Amos in answer said to Amaziah, I am no prophet, or one of the sons of the prophets; I am a herdman and one who takes care of sycamore-trees:

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.