plumb, perpendicular, erectile, erect, standing, upright, straight, rearing, stand-up, passant, more...

horizontal, flat, level, lateral, parallel

straight, plum, perpendicular, normal, more...

prime, true, local, long, horizontal, visual, right, subjective, sun, near, downward

moving up and down,   looking up and down,   going up and down,   stand upright,   straight down,   up down,   upright tree,   up right,   like power poles,   not horizontal