mediation vs services

mediation

noun
  • The act of intervening for the purpose of bringing about a settlement. 

  • heritage interpretation 

  • Negotiation to resolve differences conducted by an impartial party. 

services

noun
  • That which is produced, then traded, bought or sold, then finally consumed and consists of an action or work. 

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