payload vs shipment

payload

noun
  • That part of a cargo that produces revenue. 

  • The actual data in a data stream. 

  • The total weight of passengers, crew, equipment, and cargo carried by an aircraft or spacecraft. 

  • That part of a rocket, missile, propelled stinger, or torpedo that is not concerned with propulsion or guidance, such as a warhead or satellite. 

  • The functional part of a computer virus or another type of malware program, rather than the part that spreads it. 

shipment

noun
  • a load of goods that is transported by any method (not just by ship) 

  • the act of transporting goods 

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