Synonyms and related words :
arrowlike, billiard table, bowling green, dead flat, dead level, dead straight, direct, earth, esplanade, even, flat, flatland, flattened, floor, flush, ground, homaloid, homaloidal, horizontal axis, horizontal fault, horizontal line, horizontal parallax, horizontal plane, horizontal projection, in a line, ledge, level, level line, level plane, lineal, linear, mean sea level, parterre, plain, plane, platform, prairie, prone, rectilineal, rectilinear, right, rolled, ruler-straight, sea level, sea of grass, smooth, smoothed out, smoothened, squashed, squashed flat, steppe, straight, straight-cut, straight-front, straight-side, streamlined, supine, table, tabloid, tabular, terrace, trodden, trodden flat, TRUE, unbending, unbent, unbowed, unbroken, uncurved, undeflected, undeviating, undistorted, uninterrupted, unswerving, unturned, upright, vertical, water level