No. VIZ is not a legal English scrabble word.
No. Excelsis is not an acceptable Scrabble word.
Abbreviations are not acceptable in Scrabble.
No. Cie is not an acceptable Scrabble word.
No. Eariest is not an acceptable Scrabble word.
No. Wop is not an acceptable Scrabble word.
No. Fo is not an acceptable Scrabble word.
Yes. Jo is an acceptable Scrabble word.
Yes. Moot is an acceptable Scrabble word.
Yes. Re is an acceptable Scrabble word.
Yes, "nus" is an acceptable word in Scrabble.
In my eyes yes RN is an acceptable scrabble word.