whisperer(n = noun.person) - one who speaks in a whisper;
is a kind of speaker, talker, utterer, verbaliser, verbalizer
Derived form verb whisper1
1. One who whispers. [1913 Webster]
2. A tattler; one who tells secrets; a conveyer of intelligence secretly; hence; a backbiter; one who slanders secretly. Prov. xvi. 28. [1913 Webster]