The rare daily word game sweeping the globe. Find what's hidden in plain sight.
CAULK
Definition of CAULK
noun
Caulking.
Wiktionary · CC BY-SA
Where it comes from
From Old Northern French cauquer, from Late Latin calicāre (“to fill in with limestone, caulk”), derived from calx (“limestone, chalk”). Related to calx, cauk, chalk, and calculus.
Etymology via Wiktionary (CC BY-SA).
Word DNA
Line of descent
2 recorded generations before English.
Deepest traced root
1st
of 59 source languages in OUTLIER
30.6%
of traced words share this origin (25,330)
branch · 30.6% of traced words
How it is built
Same root, CAULK · 8 relatives in the game
OUTLIER scores every word on how unusual it is, and that number is not published. Working it out at the board is the game.
CAULK in OUTLIER
Players have found it on 46 boards so far. 110 players have found it across Outlier's history.
It first turned up on Day 7, 28 May 2026. The most recent board was Day 164, 31 October 2026. Nobody has seen it on a board for 2 days.
First found by a player on Day 7, 28 May 2026.
Built from these letters
CAULK starts with C and ends with K. Sorted, its letters read ACKLU - the shape to hunt for when the grid is scrambled. No letter is used twice, which makes it an isogram.
Words that start CAULK
Its neighbours in the OUTLIER dictionary - shortest first.
Also seen on Day 7
Could you have found CAULK?
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 7 - and most players walked straight past it.
Play today's OUTLIER