hairline vs sleek

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. 

sleek

adj
  • Slim and streamlined; not plump, thick, or stocky. 

  • Having an even, smooth surface; smooth 

  • Not rough or harsh. 

  • Glossy. 

  • Healthy, well-fed and well-groomed; in good condition. 

verb
  • To make smooth or glossy; to polish or cause to be attractive. 

noun
  • That which makes smooth; varnish. 

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