If you are going to use the prophets of the Old Testament to define what a prophet is then, the definition the Old Testament provides is the one you should use.
Number 12:6 reads:
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And he said, Hear now my words: If there be a prophet among you, I the LORD will make myself known unto him in a vision, and will speak unto him in a dream.
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That is why the title of prophet is associated with divine instruction. A person who stands up for whats right, even in the face of fierce opposition has several titles, Role Model, Man or Woman of Integrity, Hero, Pillar of Morality etc. or in the Christian vocabulary, Servant of the Lord.