IOS is valid in Collins, not in North America — 3 points

It depends on the list you play by. IOS is in Collins, used in the UK and most of the world, but it is not in the North American lists — so in a US or Canadian game an opponent can challenge it off the board. Worth 3 points. Words with Friends does not accept it either.

Which word lists accept IOS?

Word power: 32 / 100

Our own measure of how useful IOS is to know. It scores 3 from 3 tiles, takes 2 hooks, and its letters make up 7.0% of the bag. How this number is calculated

Hooks for IOS

Checked against OSPD, TWL, CSW, WWF.

How IOS scores

Face value of the 3 tiles in IOS, before any board multiplier.

Tiles you need

Drawing exactly these 3 tiles as an opening rack: 1 in 561.

What stands out about IOS

• The same 3 tiles also spell 2 other words, so the rack is worth re-reading before you play it.

Counted from the four word lists we hold, not taken from anywhere else. How we calculate things

Anagrams of IOS

The 3 tiles of IOS in a different order — 2 found.

Words ending in IOS

Showing 24 of 98 words that end in IOS. Useful as a back hook: play IOS onto a word already on the board.

Words with IOS inside

Showing 24 of 378 words that contain IOS somewhere in the middle. Words that start with IOS are listed separately above, so nothing is repeated.

Shorter words from the letters in IOS

Common questions about IOS

Is IOS valid in Words with Friends?

No. Words with Friends keeps its own list, separate from the Scrabble dictionaries, and IOS is not in it.

How many points is IOS worth?

IOS is worth 3 points in Scrabble and 3 points in Words with Friends.

What letters can be added to IOS?

IOS takes 2 hooks: 2 in front and 0 at the end.