What It Scores
EUOI is a valid word in the tournament list this site uses. Tile values only, before any premium square: 4 in Scrabble and 5 in Words With Friends. The letters break down as E1 U1 O1 I1.
Words Made From The Letters In EUOI
4 shorter words come out of these tiles. On a board that matters more than the long play, because a short word on a premium square often beats a long one on plain squares.
2 letter words (4)
Next: the Word Unscrambler for any letters at all. Full entry and definition at Merriam-Webster.