Term: tuff: hard volcanic rock composed of compacted volcanic ash
Broader: volcanic rock: extrusive igneous rock solidified near or on the surface of the Earth | Unrelated: lancer: (formerly) a cavalryman armed with a lance
Broader: volcanic rock: extrusive igneous rock solidified near or on the surface of the Earth | Unrelated: riding: the sport of siting on the back of a horse while controlling its movements
Broader: volcanic rock: extrusive igneous rock solidified near or on the surface of the Earth | Unrelated: exarch: a viceroy who governed a large province in the Roman Empire
Broader: volcanic rock: extrusive igneous rock solidified near or on the surface of the Earth | Unrelated: sourball: round piece of tart hard candy
Broader: volcanic rock: extrusive igneous rock solidified near or on the surface of the Earth | Unrelated: overpass: bridge formed by the upper level of a crossing of two highways at different levels
Broader: volcanic rock: extrusive igneous rock solidified near or on the surface of the Earth | Unrelated: capital stock: the book value of the outstanding shares of a corporation
Broader: volcanic rock: extrusive igneous rock solidified near or on the surface of the Earth | Unrelated: natural: someone regarded as certain to succeed
Broader: volcanic rock: extrusive igneous rock solidified near or on the surface of the Earth | Unrelated: communications security establishment: Canadian agency that gathers communications intelligence and assist law enforcement and security agencies
Broader: volcanic rock: extrusive igneous rock solidified near or on the surface of the Earth | Unrelated: congratulation: the act of acknowledging that someone has an occasion for celebration
Broader: volcanic rock: extrusive igneous rock solidified near or on the surface of the Earth | Unrelated: mortarboard: a square board with a handle underneath; used by masons to hold or carry mortar