What It Scores
YOYO is a valid word in the tournament list this site uses. Tile values only, before any premium square: 10 in Scrabble and 10 in Words With Friends. The letters break down as Y4 O1 Y4 O1.
Words Made From The Letters In YOYO
3 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 (3)
Next: the Word Unscrambler for any letters at all. Full entry and definition at Merriam-Webster.