keen vs mordant

keen

adj
  • Having a fine edge or point; sharp. 

  • Often with a prepositional phrase, or with to and an infinitive: showing a quick and ardent responsiveness or willingness; eager, enthusiastic, interested. 

  • Acute of mind, having or expressing mental acuteness; penetrating, sharp. 

  • Of cold, wind, etc.: cutting, penetrating, piercing, sharp. 

  • Of prices, extremely low as to be competitive. 

  • Acrimonious, bitter, piercing. 

  • Fierce, intense, vehement. 

verb
  • To utter with a loud wailing voice or wordless cry. 

  • To mourn. 

  • To make cold, to sharpen. 

  • To utter a keen. 

noun
  • A prolonged wail for a deceased person. 

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. 

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