portable vs shiftable

portable

adj
  • Able to be transferred from one organization to another. 

  • Of software: able to be run on multiple hardware or operating systems. 

  • Able to be carried or easily moved. 

  • Of a program: able to be copied directly from one machine to another without the use of an installer. 

noun
  • A trailer or other movable structure used for classes at a school. 

  • A hand-held video gaming device. 

shiftable

adj
  • That can be shifted 

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