There are quite a few modes of speaking - whispering, screaming, mumbling, and so on Today, we'll go over them in German and see if they sound the part.
nuscheln, schreien, rufen, flüstern, lispeln, säuseln
A fun look at the meaning of "rufen" and its relatives - their origin, their meanings and what calling has to do with a job and fame.
rufen, der Ruf, anrufen, ausrufen, aufrufen, der Ruhm, berühmt, der Beruf, die Berufung
The original idea of this root was:
praising, lauding with a loud voice
Old English had a few words from that family, too, that were focused on lauding, but they disappeared. The only leftovers are names, most famous among them Rudolf, which originally meant something like famous wolf.