Definitions
1.nounSomeone who whispers.
2.nounSomeone who tells secrets; a gossip.
3.nounSomeone 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.noun(by extension) 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