What is the feminine of windrower?

Answer 1

The English language is not a gendered language, though it does have gendered terms for people, clothing and animals. There is no feminine form for windrower, though a more common word used is swather. That is farm equipment for cutting hay.

However, if you meant "widower," a man who lost his wife due to death, the term for women who lose husbands to death is widow.