add Za Fe Fi Di
"za" is the 17th letter of the Arabic alphabet and is now in our dictionary (also allowed for the slang of pizza, although slang is not commonly in the dictionary).
"Fe" is only an abbreviation for Ferrum (iron), but is apparently acceptable in Scrabble so it has been added.
There is no definition for "fi" and we cannot confirm it is acceptable as a word. If others upvote it then we may consider it further.
"di" appears in the dictionary as "a tone in the ascending chromatic scale between do and re" and we have thus added it to our dictionary.
Thank you for your help!