Term: sinkhole: a depression in the ground communicating with a subterranean passage (especially in limestone) and formed by solution or by collapse of a cavern roof
Broader: natural depression: a sunken or depressed geological formation | Unrelated: circe: (Greek mythology) a sorceress who detained Odysseus on her island and turned his men into swine
Broader: natural depression: a sunken or depressed geological formation | Unrelated: harris tweed: a loosely woven tweed made in the Outer Hebrides
Broader: natural depression: a sunken or depressed geological formation | Unrelated: marxism: the economic and political theories of Karl Marx and Friedrich Engels that hold that human actions and institutions are economically determined and that class struggle is needed to create historical change and that capitalism will ultimately be superseded by communism
Broader: natural depression: a sunken or depressed geological formation | Unrelated: usurper: one who wrongfully or illegally seizes and holds the place of another
Broader: natural depression: a sunken or depressed geological formation | Unrelated: nankeen: a durable fabric formerly loomed by hand in China from natural cotton having a yellowish color
Broader: natural depression: a sunken or depressed geological formation | Unrelated: trigonometry: the mathematics of triangles and trigonometric functions
Broader: natural depression: a sunken or depressed geological formation | Unrelated: flat-coated retriever: an English breed having a shiny black or liver-colored coat; retrieves game from land or water
Broader: natural depression: a sunken or depressed geological formation | Unrelated: imposter: a person who makes deceitful pretenses
Broader: natural depression: a sunken or depressed geological formation | Unrelated: st andrews's cross: shrubby plant having yellow to apricot flowers with four petals arranged in a cross; southeastern United States: New York to Texas
Broader: natural depression: a sunken or depressed geological formation | Unrelated: invertebrate: any animal lacking a backbone or notochord; the term is not used as a scientific classification