levigate vs nonradical

levigate

adj
  • Made less harsh or burdensome; alleviated. 

  • Smooth. 

verb
  • To separate finer grains from coarser ones by suspension in a liquid. 

  • To make smooth or polish. 

  • To lighten. 

  • To belittle. 

  • To make into a smooth paste or fine powder. 

nonradical

adj
  • Not radical. 

noun
  • One who is not a radical. 

  • That which is not a radical (group of atoms that function as a unit in reactions). 

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