whisperer

Short definition from Wiktionary

Noun

1. 1
   Someone who whispers.
2. 2
   Someone who tells secrets; a gossip.
3. 3
   Someone who is skilled in taming or training a certain kind of animal, using gentle vocal commands and body language as opposed to physical contact. See horse whisperer.
4. 4
   Someone who has an uncanny ability to control or manipulate a certain thing or person; an expert or guru in a particular field or subject