斜面【しゃめん】
slope, slanting surface, bevel
傾斜【けいしゃ】
inclination, slant, slope, bevel, list, dip, tilt, lean
斜め【ななめ】
slanting, tilted, sloping, diagonal, oblique, distorted (feeling), slanted (e.g. view of the world), bad (mood), amiss, awry
斜陽【しゃよう】
setting sun, decline (e.g. of industry)