amber vs saffron

amber

adj
  • Of a brownish yellow colour, like that of most amber. 

verb
  • To take on the yellow colour of amber. 

  • To cause to take on the yellow colour of amber. 

  • To perfume or flavour with ambergris. 

  • To preserve in amber. 

noun
  • A hard, generally yellow to brown translucent fossil resin, used for jewellery. One variety, blue amber, appears blue rather than yellow under direct sunlight. 

  • The stop codon (nucleotide triplet) "UAG", or a mutant which has this stop codon at a premature place in its DNA sequence. 

  • Hesitance to proceed, or limited approval to proceed; an amber light. 

  • A yellow-orange colour. 

  • The intermediate light in a set of three traffic lights, which when illuminated indicates that drivers should stop short of the intersection when safe to do so. 

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. 

verb
  • 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. 

  • To embellish. 

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