The rare daily word game sweeping the globe. Find what's hidden in plain sight.
ISOBUTANE
Definition of ISOBUTANE
noun
A hydrocarbon, a particular isomer of C4H10 found in natural gas.
Wiktionary · CC BY-SA
Where it comes from
From iso- + butane. From being an isomer of butane, different from n-butane (“'normal' butane”).
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.
ISOBUTANE in OUTLIER
Players have found it on 13 boards so far. 16 players have found it across Outlier's history.
It first turned up on Day 27, 16 June 2026. The most recent board was Day 110, 7 September 2026. Nobody has seen it on a board for 1 day.
First found by a player on Day 27, 16 June 2026.
Built from these letters
ISOBUTANE starts with I and ends with E. Sorted, its letters read ABEINOSTU - the shape to hunt for when the grid is scrambled. No letter is used twice, which makes it an isogram.
Words that start ISOBUT
Its neighbours in the OUTLIER dictionary - shortest first.
Also seen on Day 27
Could you have found ISOBUTANE?
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 27 - and most players walked straight past it.
Play today's OUTLIER