widow is a woman whose spouse has died and a widower is a man whose spouse has died.
Wow interesting, when was the word widow first recorded in history?
Its terms are not applied to a divorcé(e) following the death of an ex-spouse
Does a woman whos second husband died after she the first one died have a special term for it?
term "widowhood" can be used for either  at least according to some dictionaries, but the word "widowerhood" is also listed in some dictionaries.