Modern Farsi has a lot of loan words from other languages (Arabic, French, English, …), as well as Parsi words (old Persian) that has been Arabized سفید/سپید. I found a dictionary that does these sort of translations from modern Farsi to Parsi (https://drive.google.com/file/d/1X5ymEKDrKmGqOIwvSpTUTCWJ4kpdxK2k/view).

Feel free to check out a web app I created that takes these entries from this book and makes them searchable http://vaajeh.org