Correction: The speech to text feature on the Kindle Fire keyboard has a profanity filter.
Probably for good reason, I don't want to be dictating something and have a word accidentally correct to something less than savory. Maybe that's just me.
That would make sense except that the entire sentence is deleted instead of prompting you for a replacement or simply blocking all corrections _towards_ those words.
Not that shocked that 'bitch' made it through. I remember being in 6th grade when our teacher told us all to not be shocked at a female dog getting referred to as such.
Luckily there are several keyboards you can use instead that are better that the stock keyboard anyway.
The keyboard app has a filter that blocks certain words from being recognized as speech.