loading vs offloading

loading

noun
  • A weighting or bias. 

  • The process by which something is loaded. 

  • A load, especially in the engineering and electrical engineering senses of force exerted, or electrical current or power supplied. 

  • A hourly pay rate given to a casual employee which is higher than the equivalent full-time or part-time employee's rate, usually paid to compensate for a lack of benefits such as sick leave or annual leave. 

offloading

noun
  • The act by which something is offloaded. 

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