Syzygos and sizigos are the same word (it translates as "spouse"). The answer to the question is true. Those two answers on wiki were probably written by different people.
However, Greeks will also say "ei gynaika sou" for "your wife" (which translate as "your woman"), and "o andra sou" for "your husband" which translates as "your man".
http://wiki.answers.com/Q/What_is_the_Greek_word_for_husband
