Chasm, chaos, and yawn are all siblings — each from a PIE root meaning "to gape open," connecting deep canyons to the primordial void to the opening of your mouth.
A deep, steep-sided opening in the earth's surface. Figuratively, a profound difference or gap between people, viewpoints, or situations.
From Latin chasma, from Greek khasma (yawning hollow, gulf, chasm), from khainein (to gape, yawn), from Proto-Indo-European *ǵheh₂- (to yawn, gape) Key roots: khasma (Greek: "yawning hollow, gulf"), *ǵheh₂- (Proto-Indo-European: "to yawn, gape").
Chasm and chaos share the same Greek root — khainein (to gape open). Chaos originally meant "the yawning void" before it meant disorder. The word "yawn" itself descends from the same PIE root *ǵheh₂-, making chasm, chaos, and yawn all linguistic siblings connected by the concept of opening wide. The Grand Canyon