* Pig Latin is a rule-based transformation, not a fixed vocabulary: You can apply the rules of Pig Latin to *any* English word, creating a new Pig Latin word. This means there's potentially an infinite number of Pig Latin words.
* The number of English words is constantly growing: New words are coined all the time, and these would also be translatable into Pig Latin.
* Pig Latin isn't a standardized language: Different variations of Pig Latin rules exist, so the number of words could change depending on the specific rules used.
So, instead of a specific number, it's more accurate to say that Pig Latin has the potential to generate a vast and ever-growing number of words.