נְבִיא nabi' "prophet"
is a word whose exact meaning and above all emotional color depends on who is
using it and in what context.
Within Amos it appears 5 times in 3 different cotexts.
In both 2:11-12 and 3:7
it refers to those through whom Adonai reveals his plans and messages. By contrast,
when Amos uses the word in reply to Amaziah denying that he is one, it seems to
have a different and negative sense (7:14),
on the reason for this and just what this sense is see the commentary.