YES, XI is acceptable (it's a Greek letter). [HINT: All of the letters of the Greek alphabet are acceptable words in Scrabble.]
TAXI.
No - The only valid two letter words using X in scrabble (interestingly you can create them with each of the vowels) are: AX EX XI OX XU
No, 'xo' is not a valid word in Scrabble. 'xi, xu, ax, and ox' are some of the valid 2 letter words in Scrabble containing 'x'. 'Xo' is valid only if you are playing Clabbers, a variation of Scrabble where and anagram of a proper word is allowed.
A Scrabble word is an English word that you can use in the Scrabble game.
AG is a legal word in scrabble.
TAXI.
No - The only valid two letter words using X in scrabble (interestingly you can create them with each of the vowels) are: AX EX XI OX XU
No, 'xo' is not a valid word in Scrabble. 'xi, xu, ax, and ox' are some of the valid 2 letter words in Scrabble containing 'x'. 'Xo' is valid only if you are playing Clabbers, a variation of Scrabble where and anagram of a proper word is allowed.
A Scrabble word is an English word that you can use in the Scrabble game.
The Latin word for XI is undecim meaning eleven.
Some stars have Xi in them. Example - Xi Bootes, Xi Hydra
AG is a legal word in scrabble.
Yes ig is a scrabble word
Yes. Cate is a legal Scrabble word.
Yes, the word queen is an acceptable word in Scrabble.
Yup. You can use the word "ag" in Scrabble.
No, it's not a valid Scrabble word.