driver's compartment vs minicab

driver's compartment

noun
  • Synonym of cab (compartment at the front of a truck or train for the driver). 

minicab

noun
  • A small car used as a taxi (rather than a traditional black cab). 

  • An unlicensed taxi. 

verb
  • To drive a minicab. 

How often have the words driver's compartment and minicab occurred in a corpus of books? (source: Google Ngram Viewer )