We don't have synonyms for whoreson yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are whoredom, thoreson and whoreman.
"1605: Though this knave came something saucily to the world before he was sent for, yet was his mother fair, there was good sport at his making, and the whoreson must be acknowledged. -- William Sakespeare, King Lear I.i"
"1605: Though this knave came something saucily to the world before he was sent for, yet was his mother fair, there was good sport at his making, and the whoreson must be acknowledged. -- William Sakespeare, King Lear I.i"