'Counsellor' in the Bible

Rehum counsellor, and Shimshai scribe have written a letter concerning Jerusalem to Artaxerxes the king, thus:

Then Rehum counsellor, and Shimshai scribe, and the rest of their companions, Dinaites, and Apharsathchites, Tarpelites, Apharsites, Archevites, Babylonians, Susanchites, (who are Elamites),

An answer hath the king sent unto Rehum counsellor, and Shimshai scribe, and the rest of their companions who are dwelling in Samaria, and the rest beyond the river, 'Peace, and at such a time: