Mi mujer (literal my woman) is also acceptable.
Novia = girlfriend Novio = boyfriend
Esposo is husband (m. spouse) Esposa is wife (f. Spouse) Los esposos (husband and wife)
Marido is husband (married man) Mujer is woman
If you use Esposo, use esposa with it If you use marido, use mujer with it.
Personally speaking to Spanish people, marido and mujer are more frequently used