"I have a wife."
Translation:Έχω μια σύζυγο.
γυναίκα means "woman", άντρας means "man", and σύζυγος means "spouse".
In a possessive context, η γυναίκα μου / ο άντρας μου means "my wife / my husband" (etc.); similarly with η σύζυγός μου / ο σύζυγός μου which could also be translated as "my wife / my husband" alongside "my spouse / my spouse".
Note that σύζυγος has a different grammatical gender depending on whether it's a male spouse or a female spouse.
(Literally, a σύζυγος is a partner that you are yoked together with, like two oxen which are joined together by their yoke and who till a field as a pair.)