What It Scores
XI is a valid word in the tournament list this site uses. Tile values only, before any premium square: 9 in Scrabble, 9 in Words With Friends, 9 in Wordfeud. The letters break down as X8 I1.
Longer Words Containing XI
XI appears inside each of these, which is what makes it worth knowing as a hook.
Next: the Word Unscrambler for any letters at all, and the two and three letter lists. Full entry and definition at Merriam-Webster.