Frequently Asked Questions

Which lexicon I must choose ? What are all those symbols that are appear next to the word in the results ? What is the probability of a word ? How do you calculate it ? Find all the answers you need here. You find below a small glossary that will explain you with some examples what is a hook, an anahook or an innerhook.

Most of the tools on the website, allows you to see some additional informations in regards to the matched words. Usually you can have access to :

  • hook of the word (both front hook and back hook)
  • anahook or anagram hook
  • small definition of the word when available. The complete definition can be find using the word analyzer.
  • probability of the word. Calculation method is explain here.
  • links, allow direct access to word analyzer of the word, of the hooks, the anahooks, the front, back and double extensions.

In order to supply more information about a word, you can find symbols like '-', '~' or '#' around it. It tells us a lot about inner hooks and extensions.

  • The left hyphen (-) indicates front inner hooks.
  • The right hyphen (-) indicates back inner hooks.
  • The left tilde (~) indicates front extensions.
  • The right tilde (~) indicates back extensions.
  • Both sharp symbol (#) indicates double extensions.

  • CSW : the Collins Scrabble Words also known as SOWPODS (an anagram of OSW+OSPD) is used in tournament in most english speaking countries.
  • TWL06 : the Tournament Word List also known as TWL2, OWL2 or OTCWL2 is a subset of CSW and is used in tournament in USA, Canada, Thailand and Israel.
  • OSPD4 : the Official Scrabble Players Dictionary is a subset of TWL06 where offensive words have been removed.

  • For seven or less letter words, it is the probability that by taking 7 tiles from a full bag you can have all the letters of the word.
  • For X letter words, where X>7 it is the probability that by taking X tiles from a full bag you can have all the letters of the word.
  • The two blank tiles are taken into account.

The downside of using probability is that it's not always meaningful. For example if you consider the 5 letter word MATES it's a lot more probable than REWAX, but REWAX is a more useful word than MATES. Furthermore, it's has no meaning to compare a 5 letter word with a 7 letter word, because 5 letter words are a lot more probable than 7 letter words, but you better have to learn 7 letter words than some 5 letter words. What's why we have introduced another measure that is called playability, based on an idea of John O'Laughlin.

To compute playability we have generated 2,000,000 automatic games and store each words that have been used. The playability of a word, is the number of times the word have been used over those 2,000,000 games. So by learning these words, you know words that are useful in a scrabble game.


A is an anahook of SIX because AXIS is a valid word.

An extension indicates that one or more letter can be added to the word and still form a valid word. We can talk about front extension, back extension or double extension.

  • REHOUSE is one the many front extensions of HOUSE.
  • HOUSED is one of the many back extensions of HOUSE.
  • CHOUSED is one of the many double extensions of HOUSE.

We can see then, that if a word have a front hook, it have a front extension. Same thing for back hook and back extension.

A hook is a letter that can be added to a word and form a valid word

  • B is a front hook of AA, because BAA is a valid word.
  • H,L and S are back hooks of AA, because AAH, AAL, and AAS are valid words.

An inner hook tolds us if by removing the first of the last letter of a word, we still have a valid word. We talk then of a front inner hook or a back inner hook.

  • HOMES have a back inner hook, because HOME is a valid word, but it doesn't have a front inner hook, because OMES is not a valid word.