circling vs radial

circling

noun
  • A circular motion. 

  • The practice of sitting in a circle and taking turns to speak about one's emotions or experiences while the others listen, intended to be therapeutic or to strengthen relations within the group. 

radial

noun
  • A radial tire / radial tyre. 

adj
  • Developing uniformly on all sides. 

  • Moving along a radius. 

  • Of, or relating to the radius bone. 

  • Of, or relating to the radius (vein), and/or the wing areas next to it. 

  • Arranged like rays that radiate from, or converge to a common centre. 

How often have the words circling and radial occurred in a corpus of books? (source: Google Ngram Viewer )