computer program vs software

computer program

noun
  • A complete piece of software. A set of instructions for a computer. This term can refer to either the executable form that a computer can execute (executable code) or the human readable form (source code). (Several programs, each of which does a task, can be collected as a software package or suite). 

software

noun
  • Hyponyms: application software, data-oriented software, kitchen table software, on-premises software, malware, schlockware, shareware, shovelware, spyware, system software 

  • Encoded computer instructions, usually modifiable (unless stored in some form of unalterable memory such as ROM). 

  • The human beings involved in warfare, as opposed to hardware such as weapons and vehicles. 

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