Hachure refers to the use of short strokes and lines to create shading and give depth to a particular image or map. Synonyms for this word include cross-hatching, stippling, and shading. Cross-hatching involves using intersecting lines to create a mesh-like texture, while stippling uses dots or small marks to create shades and tones. Shading, on the other hand, is a more general term that refers to the use of color or value to create depth and dimension in an image. Other related words include hatch, which refers to the act of making hachure lines, and engraving, which involves creating detailed images by cutting or carving into a surface.