curlicue vs incurvature

curlicue

noun
  • A fancy twisting or curling shape usually made from a series of spirals and loops. 

verb
  • To make or adorn (something) with curlicues, or as if with curlicues. 

incurvature

noun
  • curvature; curving 

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