saffron vs scum

saffron

verb
  • To embellish. 

  • To add saffron to (a food), for taste, colour etc. 

  • To dye (a fabric, garment, etc.) with a saffron-based dye. 

  • To give a saffron colour to (something). 

  • To colour (a metal or wooden surface) with a gilding product containing saffron. 

adj
  • Having an orange-yellow colour. 

noun
  • An orange-yellow colour, the colour of a lion's pelt. 

  • A spice (seasoning) and colouring agent made from the stigma and part of the style of the plant, sometimes or formerly also used as a dye and insect repellent. 

  • The plant Crocus sativus, a crocus. 

scum

verb
  • To remove (something) as scum. 

  • To startscum or savescum. 

  • To remove the layer of scum from (a liquid etc.). 

  • To become covered with scum. 

noun
  • Semen. 

  • A layer of impurities that accumulates at the surface of a liquid (especially molten metal or water). 

  • A greenish water vegetation (such as algae), usually found floating on the surface of ponds 

  • A reprehensible person or persons. 

  • The topmost liquid layer of a cesspool or septic tank. 

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