Barbara Shaw, you are right. A Coloratura is light and agile. A mezzo, fuller voice, can also be coloratura if it has the flexibility. A coloratura mezzo role is Rosina in the Barber of Seville. I'm a mezzo, and right now I have a two octave range: G below middle C, and two octaves higher.

Joe, men have falsetto, women have head voice. A woman's head voice can be brought down into the middle range so that the singer is actually mixing the head voice with the middle range. (I'll have to demonstrate next time I see you!) I don't think a man can bring falsetto down like that.

Margarita