横線 （オウセン） horizontal line

横行 （オウコウ） being rampant, being widespread, being prevalent, walking sideways, staggering, striding

縦横 （ジュウオウ） length and width, length and breadth, lengthwise and crosswise, vertical and horizontal, the four cardinal points, every direction, all directions, as one wishes, as one pleases, at will

専横 （センオウ） arbitrariness, despotism, high-handedness, tyranny

横 （よこ） horizontal (as opposed to vertical), side-to-side (as opposed to front-to-back), width, breadth, side (of a box, etc.), beside, aside, next to, unconnected

邪 （よこしま） wicked, evil, wrong, bad

真横 （まよこ） (right at the) side, just beside

縦中横 （たてちゅうよこ） using horizontal characters in vertical writing