The rare daily word game sweeping the globe. Find what's hidden in plain sight.
IONOSPHERE
Definition of IONOSPHERE
noun
The part of the Earth's atmosphere beginning at an altitude of about 50 kilometers (31 miles) and extending outward 500 kilometers (310 miles) or more.
Wiktionary · CC BY-SA
Where it comes from
From iono- + -sphere.
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.
IONOSPHERE in OUTLIER
Players have found it on 21 boards so far. 37 players have found it across Outlier's history.
It first turned up on Day 7, 28 May 2026. The most recent board was Day 109, 6 September 2026. Nobody has seen it on a board for 2 days.
First ever to find it
on Day 7, 28 May 2026 - before anyone else in Outlier's history. See the Pioneers
Built from these letters
IONOSPHERE starts with I and ends with E. Sorted, its letters read EEHINOOPRS - the shape to hunt for when the grid is scrambled. O and E appear more than once.
Words that start IONOSP
Its neighbours in the OUTLIER dictionary - shortest first.
Also seen on Day 7
Could you have found IONOSPHERE?
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