different between gyration vs circumvolution

English

gyrate +? -ion

gyration (plural gyrations)

The act of turning or whirling, as around a fixed center; a circular or spiral motion; motion about an axis; rotation; revolution.
- 1881, Symon's monthly meteorological magazine (page 59)
  If you question a seaman on the subject, whether mere coaster or circumnavigator, he will tell you that in a snow-storm, because of its constant eddyings and gyrations, frequent trimming of sails is more necessary than in any other gale […]
One of the whorls of a spiral univalve shell.
Appropriate arrangement of convolutions of gyri in the cerebral cortex.

circum- +? volution

circumvolution (countable and uncountable, plural circumvolutions)

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