Yes it is Fa is part of the musical scale
No. Qu is not a valid Scrabble word.
Nope. Indew is not a valid Scrabble word.
Yes. Ex is a valid Scrabble word.
No. Oz is not a valid Scrabble word.
No. Xe is not a valid Scrabble word.
No. Qu is not a valid Scrabble word.
Yes. Speculate is a valid Scrabble word.
Nope. Indew is not a valid Scrabble word.
Yes, "ax" is a valid Scrabble word.
Yes, "keyword" is a valid Scrabble word.
Yes, "scramble" is a valid Scrabble word.
Yes, "Scrabble" is considered a valid word in the game of Scrabble.
Yes. Ex is a valid Scrabble word.
No. Oz is not a valid Scrabble word.
Yes, "lez" is a valid word in the game of Scrabble.
Yes; as the word representing the fourth tone on the diatonic musical scale (do, re, mi) fa is an acceptable Scrabble word.
No. Xe is not a valid Scrabble word.