brill vs hairline

brill

noun
  • A type of flatfish, Scophthalmus rhombus. 

adj
  • Wonderful, amusing; cool 

hairline

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. 

adj
  • very thin, as thin as a hair 

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