mordant vs pungent

mordant

adj
  • Having or showing a sharp or critical quality 

  • Serving to fix a dye to a fibre. 

noun
  • A glutinous size used as a ground for gilding, to make the gold leaf adhere. 

  • Any substance used to facilitate the fixing of a dye to a fibre; usually a metallic compound which reacts with the dye using chelation. 

  • Any corrosive substance used in etching. 

verb
  • To subject to the action of, or imbue with, a mordant. 

pungent

adj
  • Having a sharp and stiff point. 

  • Stinging; acerbic. 

  • Having a strong odor that stings the nose, said especially of acidic or spicy substances. 

  • Having a strong taste that stings the tongue, said especially of hot (spicy) food, which has a strong and sharp or bitter taste. 

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