Synonym word of planar:

alike, balanced, consistent, constant, continual, continuous, direct, equal, flat, flush, homogenous, horizontal, level, matching, metrical, parallel, planate, plane, plumb, proportional, regular, right, same, smooth, square, stabile, stable, steady, straight, surfaced, true, unbroken, unchanging, undeviating, unfluctuating, uninterrupted, unvaried, unvarying, unwavering, unwrinkled