flushing vs riddle

flushing

noun
  • A heavy, coarse cloth manufactured from shoddy. 

  • A surface formed of floating threads. 

  • Rushing of blood to the skin's surface, especially on the face, as happens under various physiological circumstances (e.g., in embarrassment or stress or during menopause). 

  • The act by which something is flushed. 

riddle

noun
  • A sieve with coarse meshes, usually of wire, for separating coarser materials from finer, as chaff from grain, cinders from ashes, or gravel from sand. 

  • A board with a row of pins, set zigzag, between which wire is drawn to straighten it. 

  • A verbal puzzle, mystery, or other problem of an intellectual nature. 

  • An ancient verbal, poetic, or literary form, in which, rather than a rhyme scheme, there are parallel opposing expressions with a hidden meaning. 

  • One of the pair of curtains enclosing an altar on the north and south. 

verb
  • To fill with holes like a riddle. 

  • To speak ambiguously or enigmatically. 

  • To fill or spread throughout; to pervade. 

  • To put something through a riddle or sieve; to sieve; to sift. 

  • To solve, answer, or explicate a riddle or question. 

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