cordial vs improver

cordial

noun
  • Anything that revives or comforts, a stimulant. 

  • A liqueur prepared using the infusion process. 

  • A pleasant-tasting medicine. 

  • A candy (or bonbon) usually made of milk chocolate, filled with small fruits (often maraschino cherries) and syrup or fondant. 

  • A concentrated non-carbonated soft drink which is diluted with water before drinking. 

  • An individual serving of such a diluted drink. 

adj
  • Tending to revive, cheer, or invigorate; giving strength or spirits. 

  • Radiating warmth and friendliness; genial. 

  • Hearty; sincere; warm; affectionate. 

improver

noun
  • Something that, or someone who, improves something. 

  • One who improves his or her performance, one who shows improvement (of individuals or groups). 

  • A substance added to cause improvement (especially to a foodstuff). 

  • A pad worn by women to make the dress hang properly. 

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