aftercare vs improvement

aftercare

noun
  • Services and support offered to a customer for the goods or service they have purchased. 

  • Tender affection and care given to a partner after a BDSM activity, usually to serve as a transition between the activity and whatever follows it. 

  • Childcare services tending to children after the school day. 

  • The care given to a patient during recovery from an operation or after hospitalization. 

  • Emotional support offered by the programme makers to a person who has appeared on a stressful talk show, etc. 

improvement

noun
  • Something which is improved 

  • Increase; growth; progress; advance. 

  • The act of improving; advancement or growth; a bettering 

  • Valuable additions or betterments, for example buildings, clearings, drains, fences, etc., on premises. 

  • A useful addition to, or modification of, a machine, manufacture, or composition. 

  • The state of being improved; betterment; advance 

  • The act of making profitable use or application of anything, or the state of being profitably employed; practical application, for example of a doctrine, principle, or theory, stated in a discourse. 

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