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"level" is also used as a crossword clue. If that's what you saw, the answer is often horizontal (10 letters).
Definitions
Height or degree; flat position
Word origin
From Middle English level, from Old French livel, liveau m, later nivel, niveau, from Latin libella f (“a balance, a level”), diminutive of libra f (“a balance, a level”); see libra, librate. Doublet of libella and niveau.
Used in a sentence
“This table isn't quite level; see how this marble rolls off it?”
“the smooth and level pavement”
“We tried to hang the pictures so that the bottom of the frames were level with the dark line in the wallpaper.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer6 curated clues
01“Even or flat”5 letters
02“Even, as a surface”5 letters
03“Even, not slanted”5 letters
04“Game stage”5 letters
05“Not sloped”5 letters
06“Flat and even”5 letters
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