hairline vs silky

hairline

adj
  • very thin, as thin as a hair 

noun
  • A fishing line made from hair. 

  • The line along one's forehead where hair starts growing. 

  • A very thin line in writing, drawing, or typography. 

  • A very thin fissure. 

silky

adj
  • Covered in long, slender, glistening hairs pressed close to the surface; sericeous. 

  • Similar in appearance or texture (especially in softness and smoothness) to silk. 

  • Smooth and pleasant; seductive. 

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