Only in Collins.
IO is valid in the international Collins list used for crossword tile games outside North America, but not in the North American list.
IO is valid in the international Collins list but not in the NASPA Word List 2023, the North American list. If your group plays with the Collins toggle on, it counts; otherwise it can be challenged off the board.
About IO
In Greek myth, Io was also a priestess turned into a heifer, but in the Collins list the word is the shout of joy. Under North American rules, put the I and O to work in OI instead.
Settle the next one at the table: score your game free in Tileside →
IO scores 2 points
Before any bonus squares: I 1 + O 1 = 2. On a double-word square that's 4, on a triple-word 6, and every letter bonus under one of these tiles is applied first.
Example: IO as the first play
Later in the game, put the I on a 3L square and IO is worth 4 before any word bonus.
Hooks: one tile makes a new word
Longer words from IO
Words that start with IO:
Change one tile
Swap any one letter of IO and these are still words:
Same letters, other words
These use exactly the letters of IO:
- OIused to express dismay or pain, or to call out
Memory tip
IO is a cry of triumph, from ancient Greek. It is valid only in the Collins list, where it clears two vowels at once.
On these lists
Other two-letter words starting with I
Check words at the table, free
Tileside keeps score, checks words like this one during a challenge, tracks the tiles left in the bag and times turns. It runs in your phone's browser with no account and works offline.
Tileside checks words against the North American list, the NASPA Word List 2023. Your group's chosen dictionary always wins. Playing the international (Collins) list? Turn on its 20 extra two-letter words in Setup.
Word list: NASPA Word List 2023, used under license. NASPA Word List 2023 Edition © NASPA 2023. The copy included in this app is licensed for personal use. You may not use it for any commercial purposes.
Works with the Scrabble board game, played at the table. Tileside is an independent product, not affiliated with or endorsed by the makers of Scrabble.