[thelist] SEO for multiple phrasing for the same thing- synonyms?

[Rich Points]

Howdy,
I'm doing some SEO for a client who wants to optimize a word that can be 
written 5 different ways;
1) Demi-Glace
2) Demi Glace
3) Demi Glaze
4) Demiglace
5) Demiglaze

The way I've got the SEO configured right now is just focusing on  
Demi-Glace which gets a google return of 4, the others variations don't 
do as well or don't show up at all. 

I suppose the best way to do this would be to create individual pages 
that focus on each keyword.  I don't think that will work here because 
it would likely result in pages with duplicate content, a SEO no no.

How do I run a SEO campaign that will target all these variations?

Thanks
Rich