shading vs hachure

shading and hachure both are nouns.

Word	Noun	Adjective	Verb	Adverb
shading	Yes	No	No	No
hachure	Yes	No	No	No

As nouns, hachure is a hyponym of shading; that is, hachure is a word with a more specific, narrower meaning than shading:

shading: graded markings that indicate light or shaded areas in a drawing or painting
hachure: shading consisting of multiple crossing lines

Other hyponyms of shading include crosshatch, hatch, hatching.

shading (noun)	hachure (noun)
a gradation involving small or imperceptible differences between grades	shading consisting of multiple crossing lines
graded markings that indicate light or shaded areas in a drawing or painting