Difference between Bastardy and Illegitimacy

What is the difference between Bastardy and Illegitimacy?

Bastardy as a noun is the condition of being illegitimate, of being born to an unmarried woman or as the fruit of adultery. while Illegitimacy as a noun is the state or condition of being illegitimate

We hope you now know whether to use Bastardy or Illegitimacy in your sentence.