THESAURUS
abrupt, acmatic, apical, arrowlike, azimuth circle, bluff, bold, bolt upright, breakneck, capital, chief, consummate, dead straight, direct, downright, erect, even, flat, head, headlong, headmost, highest, horizontal, in a line, level, lineal, linear, maximal, maximum, meridian, meridional, normal, orthodiagonal, overmost, paramount, perpendicular, plumb, plunging, precipitous, preeminent, rampant, rapid, rearing, rectilineal, rectilinear, right, right angle, ruler-straight, sharp, sheer, smooth, stand-up, standing up, steep, straight, straight-cut, straight-front, straight-side, straight-up, streamlined, summital, supreme, tip-top, top, topmost, true, ultimate, unbending, unbent, unbowed, unbroken, uncurved, undeflected, undeviating, undistorted, uninterrupted, unswerving, unturned, up-and-down, upended, upmost, uppermost, upraised, upreared, upright, upstanding,
vertical circle, zenithal
ROGET THESAURUS
Verticality
N
verticality, erectness, perpendicularity, right angle, normal, azimuth circle, wall, precipice, cliff, elevation, erection, square, plumb line, plummet,
vertical, upright, erect, perpendicular, plumb, normal, straight, bolt, upright, rampant, standing up, rectangular, orthogonal, vertically, up, on end, up on end, right on end, a plomb, endwise, one one's legs, at right angles.