The rare daily word game sweeping the globe. Find what's hidden in plain sight.
CAISSON
Definition of CAISSON
noun
A (permanent) enclosure from which water can be expelled, in order to give access to underwater areas for engineering works etc.
Wiktionary · CC BY-SA
Where it comes from
Borrowed from French caisson. Doublet of cassone and cajón.
Etymology via Wiktionary (CC BY-SA).
OUTLIER scores every word on how unusual it is, and that number is not published. Working it out at the board is the game.
CAISSON in OUTLIER
Players have found it on 1 board so far.
It first turned up on Day 124, 21 September 2026. It was on the latest finished board.
First ever to find it
on Day 124, 21 September 2026 - before anyone else in Outlier's history. See the Pioneers
Built from these letters
CAISSON starts with C and ends with N. Sorted, its letters read ACINOSS - the shape to hunt for when the grid is scrambled. S appears more than once, including a double letter.
Same letters, different word
2 other words use exactly these letters. Worth knowing at the board: an anagram fits a grid the same way.
Words that start CAISSO
Its neighbours in the OUTLIER dictionary - shortest first.
Could you have found CAISSON?
OUTLIER is a daily word game. One grid, the same grid for everybody, and the words nobody else spots are the ones that pay. This word was on Day 124 - and most players walked straight past it.
Play today's OUTLIER