It is a game-like application designed to check your vocabulary.
Download on the Mac App Store

Alternative apps

Neven
Neven
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Word puzzle game: find words within a honeycomb of letters.

Crossword Wizard
Crossword Wizard
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Crossword Wizard will allow you to create crosswords for your students.

Crazy Letters
Crazy Letters
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Guess a word in up to five attempts and then suggest a new word.

Letter Chain
Letter Chain
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You should form words using the letters given on the screen.

Mahjong Letters
Mahjong Letters
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Mahjong Puzzle combines a mahjong with a word game.