The Primary Role of Prophets

What does the word "nabi" communicate about the primary role of prophets?
Dr. Douglas Gropp
I think etymologically the word, or the most common word, for prophet in the Old Testament, (nabi), is correctly understood as a passive noun form from a verb which must have meant "to call," and so a prophet was one who was called. In context of the prophets, prophets are those who are sent; that is, they are called in the sense that they are called to a commission. Prophets are commissioned. But in actual usage, I think when the Old Testament uses the term (nabi), it's especially in close association with the prophet speaking and speaking the words of the Lord.
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