outflow vs purl

outflow

noun
  • A fluid that flows out. 

  • Any outward movement. 

  • Something that flows out of a sewage treatment plant. 

  • The process of flowing out. 

  • A stream of gaseous material emanating from an active galactic nucleus. 

  • The part of a system that allows material to flow out. 

verb
  • To flow outward. 

purl

noun
  • A circle made by the motion of a fluid; an eddy; a ripple. 

  • A gentle murmuring sound, such as that produced by the running of a liquid among obstructions. 

  • A tern. 

  • a heavy or headlong fall; an upset. 

  • A particular stitch in knitting; an inversion of stitches giving the work a ribbed or waved appearance. 

  • The edge of lace trimmed with loops. 

  • An embroidered and puckered border; a hem or fringe, often of gold or silver twist; also, a pleat or fold, as of a band. 

verb
  • To rise in circles, ripples, or undulations; to curl; to mantle. 

  • To use an inverted stitch producing ribbing etc. 

  • To flow with a murmuring sound in swirls and eddies. 

  • To decorate with fringe or embroidered edge 

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