Hachure

2 clues
Elevation line on map
Line shading used on maps.
Similar answers:
Achachach
Agathachristie
Aghachristie
Ahac
Alohacarte
Alphacentauri
Anthacite
Apoliticalhackdidbewail
Aramkhachaturian
Atollsaramkhach
Atombwithaclue
Baddieshack
Baileathacliath
Berthachrist
Brochure
Brochures
Buddyhackett
Bushwhack
Bushwhacker
Bushwhackers