husband
wife
A wife could be the opposite of a widow- woman whose husband is dead. A widower could also be the opposite of widow- a widower is a man whose wife is dead.
Wife or Married Women
The wife of an Earl is called a Countess.
El Cid's wife was portrayed by Sophia Loren.
nothing
If you mean the feminine equivalent of husband the word you are looking for is wife.
Marquess or Marchioness
The title for a woman (or the wife of a Lord) would be "Lady."
A widower is the name given to a husband who has lost his wife.
The antonyms for spinster (an unmarried woman) are wife, widow, or divorcee.(The opposite gender of the female spinster would be a bachelor.)
There are lots of sexual positions that fit with fat men. One of these positions for example is the opposite sexual position in which the wife is on the top either with her face to the side of man's face or with her face on the opposite direction.