mezzo soprano means a a voice that is somewhere between being an alto and soprano

is there a word for a singer whose register is very wide, meaning she can hit soprano 1 notes as well as contralto notes?

just wondering.....

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insanity is what keeps me sane

They don't place anybody in that register, in a choral situation especially.
If you're doing solo work, they will occasionally place a singer in a song that's up and down the scale, but there's no specific voice register for that.  It's just called having a wide range.

If you're talking choral situations, a director will find the place in your vocal register where you are most comfortable, and can belt your notes loudest and clearest.

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This signature stays until Jake Davis
Has returned from basic army training.
Departure: 10:00AM on 8/19/2008